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Summary of Significant Accounting Policies (Policies) | 12 Months Ended
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Dec. 31, 2011
Summary of Significant Accounting Policies (Policies) [Abstract] |
Management's Estimates and Assumptions | Management’s Estimates and Assumptions In preparing our financial statements, we make numerous estimates and assumptions that affect the amounts reported in these financial statements and accompanying notes. We must make these estimates and assumptions because certain information that we use is dependent on future events, cannot be calculated with a high degree of precision from data available or simply cannot be readily calculated based on generally accepted methodologies. In preparing our financial statements, the more critical and subjective areas that deal with the greatest amount of uncertainty relate to our accounting for our long-lived assets, including recoverability, landfill development costs, and final capping, closure and post-closure costs, our valuation allowances for accounts receivable and deferred tax assets, our liabilities for potential litigation, claims and assessments, our liabilities for environmental remediation, employee benefit plans, deferred taxes, uncertain tax positions, self-insurance reserves, and our estimates of the fair values of assets acquired and liabilities assumed in any acquisition. Each of these items is discussed in more detail elsewhere in the Notes to the Consolidated Financial Statements. Our actual results may differ significantly from our estimates.
Cash and Cash Equivalents | Cash and Cash Equivalents We consider liquid investments with an original maturity at the date of acquisition of three months or less to be cash equivalents. We may have net book credit balances in our primary disbursement accounts at the end of a reporting period. We classify such credit balances as accounts payable in our consolidated balance sheets as checks presented for payment to these accounts are not payable by our banks under overdraft arrangements, and, therefore, do not represent short-term borrowings. As of December 31, 2011 and 2010, there were net book credit balances of $85.6 million and $94.8 million in our primary disbursement accounts which were classified as accounts payable on our consolidated balance sheets.
Concentration of Credit Risk | Concentration of Credit Risk Financial instruments that potentially subject us to concentrations of credit risk consist of cash and cash equivalents, trade accounts receivable and derivative instruments. We place our cash and cash equivalents with high quality financial institutions. Such balances may be in excess of FDIC insured limits. To manage the related credit exposure, we continually monitor the credit worthiness of the financial institutions where we have deposits. Concentrations of credit risk with respect to trade accounts receivable are limited due to the wide variety of customers and markets in which we provide services, as well as the dispersion of our operations across many geographic areas. We provide services to commercial, industrial, municipal and residential customers in the United States and Puerto Rico. We perform ongoing credit evaluations of our customers, but do not require collateral to support customer receivables. We establish an allowance for doubtful accounts based on various factors including the credit risk of specific customers, age of receivables outstanding, historical trends, economic conditions and other information. No customer exceeded 5% of our outstanding accounts receivable balance at December 31, 2011 and 2010.
Accounts Receivable, Net of Allowance for Doubtful Accounts | Accounts Receivable, Net of Allowance for Doubtful Accounts Accounts receivable represent receivables from customers for collection, transfer, recycling, disposal and other services. Our receivables are recorded when billed or when the related revenue is earned, if earlier, and represent claims against third parties that will be settled in cash. The carrying value of our receivables, net of the allowance for doubtful accounts, represents their estimated net realizable value. Provisions for doubtful accounts are evaluated on a monthly basis and are recorded based on our historical collection experience, the age of the receivables, specific customer information and economic conditions. We also review outstanding balances on an account-specific basis. In general, reserves are provided for accounts receivable in excess of ninety days old. Past due receivable balances are written-off when our collection efforts have been unsuccessful in collecting amounts due. The following table reflects the activity in our allowance for doubtful accounts for the years ended December 31, 2011, 2010 and 2009:
|  | 2011 |  |  | 2010 |  |  | 2009 |
Balance at beginning of year |  | $ | 50.9 |  |  | $ | 55.2 |  |  | $ | 65.7 |
Additions charged to expense |  |  | 21.0 |  |  |  | 23.6 |  |  |  | 27.3 |
Accounts written-off |  |  | (23.8 | ) |  |  | (27.9 | ) |  |  | (37.8 | )
Balance at end of year |  | $ | 48.1 |  |  | $ | 50.9 |  |  | $ | 55.2 |
Restricted Cash and Restricted Marketable Securities | Restricted Cash and Marketable Securities As of December 31, 2011, we had $189.6 million of restricted cash and marketable securities. We obtain funds through the issuance of tax-exempt bonds for the purpose of financing qualifying expenditures at our landfills, transfer stations, collection and materials recovery facilities. The funds are deposited directly into trust accounts by the bonding authorities at the time of issuance. As the use of these funds is contractually restricted, and we do not have the ability to use these funds for general operating purposes, they are classified as restricted cash and marketable securities in our consolidated balance sheets. In the normal course of business, we may be required to provide financial assurance to governmental agencies and a variety of other entities in connection with municipal residential collection contracts, closure or post- closure of landfills, environmental remediation, environmental permits, and business licenses and permits as a financial guarantee of our performance. At several of our landfills, we satisfy financial assurance requirements by depositing cash into restricted trust funds or escrow accounts.
Property and Equipment | Property and Equipment Property and equipment are recorded at cost. Expenditures for major additions and improvements to facilities are capitalized, while maintenance and repairs are charged to expense as incurred. When property is retired or otherwise disposed of, the related cost and accumulated depreciation are removed from the accounts and any resulting gain or loss is reflected in the consolidated statements of income. We revise the estimated useful lives of property and equipment acquired through business acquisitions to conform with our policies. Depreciation is provided over the estimated useful lives of the assets involved using the straight-line method. We assume no salvage value for our depreciable property and equipment. The estimated useful lives of our property and equipment are as follows:
|  | Estimated Useful Lives |
Buildings and improvements |  |  | 7 - 40 years |
Vehicles |  |  | 5 - 12 years |
Landfill equipment |  |  | 7 - 10 years |
Other equipment |  |  | 3 - 15 years |
Furniture and fixtures |  |  | 5 - 12 years |
Landfill development costs are also included in property and equipment. Landfill development costs include direct costs incurred to obtain landfill permits and direct costs incurred to acquire, construct and develop sites as well as final capping, closure and post-closure assets. These costs are amortized or depleted based on consumed airspace. All indirect landfill development costs are expensed as incurred. For additional information, see Note 8, Landfill and Environmental Costs.
Capitalized Interest | Capitalized Interest We capitalize interest on landfill cell construction and other construction projects if they meet the following criteria:
| • |  | Total construction costs are $50,000 or greater,
| • |  | The construction phase is one month or longer, and
| • |  | The assets have a useful life of one year or longer.
Interest is capitalized on qualified assets while they undergo activities to ready them for their intended use. Capitalization of interest ceases once an asset is placed into service or if construction activity is suspended for more than a brief period of time. Our interest capitalization rate is based on our weighted average cost of indebtedness. Interest capitalized was $8.1 million, $6.3 million and $7.8 million for the years ended December 31, 2011, 2010 and 2009, respectively.
Fair Value of Financial Instruments | Fair Value of Financial Instruments Our financial instruments include cash and cash equivalents, restricted cash and marketable securities, fuel, commodity and interest rate hedges, long-term debt and assets in our defined benefit plan. Accounting standards include disclosure requirements around fair values used for certain financial instruments and establish a fair value hierarchy. The hierarchy prioritizes valuation inputs into three levels based on the extent to which inputs used in measuring fair value are observable in the market. Each fair value measurement is reported in one of three levels:
| • |  | Level 1 – inputs are based upon unadjusted quoted prices for identical instrument traded in active markets.
| • |  | Level 2 – inputs are based upon quoted prices for similar instruments in active markets, quoted prices for identical or similar instruments in markets that are not active, and model-based valuation techniques for which all significant assumptions are observable in the market or can be corroborated by observable market data for substantially the full term of the assets or liabilities.
| • |  | Level 3 – inputs are generally unobservable and typically reflect management’s estimates of assumptions that market participants would use in pricing the asset or liability. The fair values are therefore determined using model-based techniques that include option pricing models, discounted cash flow models, and similar techniques.
See Note 9, Debt, Note 11, Employee Benefit Plans, and Note 15, Financial Instruments, for fair value disclosures related to our long-term debt, defined benefit pension plan investments, restricted cash and marketable securities and derivative instruments, respectively.
Investments Other Than Derivatives | Investments Other Than Derivatives Investments other than derivatives primarily include money market funds, common stock, mutual funds, real estate investment trusts, U.S. government and agency securities, municipal and corporate bonds, foreign government and corporate bonds. In general, and where applicable, we use quoted prices in active markets for identical assets or liabilities to determine fair value. This pricing methodology applies to our Level 1 investments, such as money market funds, common stock and certain mutual funds. If quoted prices in active markets for identical assets or liabilities are not available to determine fair value, then we use quoted prices for similar assets and liabilities or inputs other than the quoted prices that are observable either directly or indirectly. These investments are included in Level 2 and consist primarily of corporate bonds, foreign government bonds, real estate investment trusts and certain agency securities.
Derivative Financial Instruments | Derivative Financial Instruments We use derivative financial instruments to manage our risk associated with changing interest rates and changing prices for commodities we frequently purchase or sell by creating offsetting market exposures. Historically, we used interest rate swap agreements to manage risk associated with fluctuations in interest rates. We have entered into multiple agreements designated as cash flow hedges to mitigate some of our exposure to changes in diesel fuel prices and prices of certain recycling commodities. All derivatives are measured at fair value and recognized in the balance sheet as assets or liabilities, as appropriate. For derivatives designated as cash flow hedges, changes in fair value of the effective portions of derivative instruments are reported in stockholders’ equity as components of other comprehensive income until the forecasted transaction occurs or is not probable of occurring. When the forecasted transaction occurs or is not probable of occurring, the realized net gain or loss is then recognized in the consolidated statements of income. Changes in fair value of the ineffective portions of derivative instruments are recognized currently in earnings. The fair values of our diesel fuel and recycling commodity hedges are determined using standard valuation models with assumptions about prices and other relevant information based on those observed in the underlying markets (Level 2 in the fair value hierarchy). The estimated fair values of derivatives used to hedge risks fluctuate over time and should be viewed in relation to the underlying hedged transactions.
Landfill and Environmental Costs | Landfill and Environmental Costs Life Cycle Accounting We use life-cycle accounting and the units-of-consumption method to recognize certain landfill costs over the life of the site. In life cycle accounting, all costs to acquire and construct a site are capitalized, and charged to expense based on the consumption of cubic yards of available airspace. Costs and airspace estimates are developed at least annually by engineers. We use these estimates to adjust the rates we use to deplete capitalized costs. Changes in these estimates primarily relate to changes in available airspace, inflation and applicable regulations. Changes in available airspace include but are not limited to changes due to the addition of airspace lying in probable expansion areas, airspace consumed and changes in engineering estimates.
Probable Expansion Airspace | Probable Expansion Airspace We classify landfill disposal capacity as either permitted (having received the final permit from the applicable regulatory agency) or as probable expansion airspace. Before airspace included in an expansion area is determined to be probable expansion airspace and, therefore, is included in our calculation of total available disposal capacity, all of the following criteria must be met:
| • |  | We own the land associated with the expansion airspace or control it pursuant to an option agreement,
| • |  | We are committed to supporting the expansion project financially and with appropriate resources,
| • |  | There are no identified fatal flaws or impediments associated with the project, including political impediments,
| • |  | Progress is being made on the project,
| • |  | The expansion is attainable within a reasonable time frame, and
| • |  | We believe it is likely will receive the expansion permit.
Upon meeting our expansion criteria, the rates used at each applicable landfill to expense costs to acquire, construct, cap, close and maintain a site during the post-closure period are adjusted to include both the probable expansion airspace and the additional costs to be capitalized or accrued associated with that expansion airspace. We have identified three steps that landfills generally follow to obtain expansion permits. These steps are as follows:
1. | Obtaining approval from local authorities,
2. | Submitting a permit application to state authorities, and
3. | Obtaining permit approval from state authorities.
We continually monitor our progress toward obtaining permits for each of our sites with probable airspace. If we determine that a landfill expansion area no longer meets our criteria, the probable expansion airspace is removed from the landfill’s total available capacity and the rates used at the landfill to deplete costs to acquire, construct, cap, close and maintain a site during the post-closure period are adjusted accordingly. In addition, any amounts capitalized for the probable expansion airspace are charged to expense in the period in which it is determined that the criteria are no longer met.
Capitalized Landfill Costs | Capitalized Landfill Costs Capitalized landfill costs include expenditures for land, permitting, cell construction and environmental structures. Capitalized permitting and cell construction costs are limited to direct costs relating to these activities, including legal, engineering and construction costs associated with excavation, natural and synthetic liners, construction of leachate collection systems, installation of methane gas collection and monitoring systems, installation of groundwater monitoring wells and other costs associated with the development of the site. Interest is capitalized on landfill construction projects while the assets are undergoing activities to ready them for their intended use. Capitalized landfill costs also include final capping, closure and post-closure assets and are depleted as airspace is consumed using the units-of-consumption method. Costs related to acquiring land, excluding the estimated residual value of unpermitted, non-buffer land, and costs related to permitting and cell construction are depleted as airspace is consumed using the units-of-consumption method. Capitalized landfill costs may also include an allocation of purchase price paid for landfills. For landfills purchased as part of a group of assets, the purchase price assigned to the landfill is determined based on the estimated fair value of the landfill relative to the fair value of other assets within the acquired group. If the landfill meets our expansion criteria, the purchase price is further allocated between permitted airspace and expansion airspace based on the ratio of permitted versus probable expansion airspace to total available airspace. Landfill purchase price is amortized using the units-of-consumption method over the total available airspace including probable expansion airspace where appropriate.
Environmental Liabilities | Final Capping, Closure and Post-Closure Costs Final capping We have future obligations for final capping, closure and post-closure costs with respect to the landfills we own or operate as set forth in applicable landfill permits. The permit requirements are based on the Subtitle C and Subtitle D regulations of the Resource Conservation and Recovery Act (RCRA), as implemented and applied on a state-by-state basis. We define final capping as activities required to permanently cover a portion of a landfill that has been completely filled with waste. Final capping typically includes installing flexible membrane and geosynthetic clay liners, drainage and compact soil layers, and topsoil, and is constructed over an area of the landfill where total airspace capacity has been consumed and waste disposal operations have ceased. These final capping activities occur in phases as needed throughout the operating life of a landfill as specific areas are filled to capacity and the final elevation for that specific area is reached in accordance with the provisions of the operating permit. We consider final capping events to be discrete activities that are recognized as asset retirement obligations separately from other closure and post-closure obligations. As a result, we use a separate rate per ton for recognizing the principal amount of the liability and related asset associated with each capping event. We amortize the asset recorded pursuant to this approach as waste volume related to the capacity covered by the capping event is placed into the landfill based on the consumption of cubic yards of available airspace. Closure and post-closure Closure and post-closure activities occur after the entire landfill ceases to accept waste and closes. These activities involve methane gas control, leachate management and groundwater monitoring, surface water monitoring and control, and other operational and maintenance activities that occur after the site ceases to accept waste. Obligations associated with monitoring and controlling methane gas migration and emissions are set forth in applicable landfill permits and these requirements are based on the provisions of the Clean Air Act. The post-closure period generally runs for up to 30 years after final site closure for municipal solid waste landfills and a shorter period for construction and demolition landfills and inert landfills. We recognize asset retirement obligations and the related amortization expense for closure and post-closure (excluding obligations for final capping) using the units-of-consumption method over the total remaining capacity of the landfill. The total remaining capacity includes probable expansion airspace. Estimated future expenditures Estimates of future expenditures for final capping, closure and post-closure are developed at least annually by engineers. These estimates are reviewed by management and are used by our operating and accounting personnel to adjust the rates used to capitalize and amortize these costs. These estimates involve projections of costs that will be incurred during the remaining life of the landfill for final capping activities, after the landfill ceases operations and during the legally required post-closure monitoring period. We currently retain post-closure responsibility for 130 closed landfills. Fair value measurements In general, we engage third parties to perform most of our final capping, closure and post-closure activities. Accordingly, the fair value of these activities is based on quoted and actual prices paid for similar work. We also perform some of our final capping, closure and post-closure activities using internal resources. Where we expect internal resources to be used to fulfill an asset retirement obligation, we add a profit margin to the estimated cost of such services to better reflect their fair value. If we perform these services internally, the added profit margin is recognized as a component of operating income in the period the obligation is settled. An estimate of fair value should include the price that marketplace participants are able to receive for bearing the uncertainties in cash flows. However, when utilizing discounted cash flow techniques, reliable estimates of market premiums may not be obtainable. In this situation, it is not necessary to consider a market risk premium in the determination of expected cash flows. While the cost of asset retirement obligations associated with final capping, closure and post-closure can be quantified and estimated, there is not an active market that can be utilized to determine the fair value of these activities. In the waste industry, there generally is not a market for selling the responsibility for final capping, closure and post-closure independent of selling the landfill in its entirety. Accordingly, we believe that it is not possible to develop a methodology to reliably estimate a market risk premium and have excluded a market risk premium from our determination of expected cash flow for landfill asset retirement obligations. Absent quoted market prices, the estimate of fair value is based on the best available information, including the results of present value techniques. Our estimates of costs to discharge asset retirement obligations for landfills are developed in today’s dollars. These costs are inflated each year to reflect a normal escalation of prices up to the year they are expected to be paid. We use a 2.5% inflation rate, which is based on the ten-year historical moving average increase of the U.S. Consumer Price Index, and is the rate used by most waste industry participants. These estimated costs are then discounted to their present value using a credit-adjusted, risk-free interest rate. In general, the credit-adjusted, risk-free interest rate we used for liability recognition was 6.0% and 5.5% for the years ended December 31, 2011 and 2010, respectively, which was based on the estimated all-in yield we would have needed to offer to sell thirty-year debt in the public market. However, as part of the initial application of purchase accounting, our capping, closure and post-closure obligations acquired from Allied Waste Industries, Inc. (Allied) were recorded at their fair values as of the acquisition date, and were discounted using a rate of 9.75% due to market conditions at the time of the acquisition. Changes in assets retirement obligations A liability for an asset retirement obligation is recognized in the period in which it is incurred and is initially measured at fair value. The offset to the liability is capitalized as part of the carrying amount of the related long-lived asset. Changes in the liabilities due to revisions to estimated future cash flows are recognized by increasing or decreasing the liabilities with the offsets adjusting the carrying amounts of the related long-lived assets, and may also require immediate adjustments to amortization expense in the consolidated statement of income. Upward revisions in the amount of undiscounted estimated cash flows used to record a liability are discounted using the credit-adjusted, risk-free interest rate in effect at the time of the change. Downward revisions in the amount of undiscounted estimated cash flows used to record a liability are discounted using the credit-adjusted, risk-free rate that existed when the original liability was recognized. Changes in asset retirement obligations due to the passage of time are measured by recognizing accretion expense in a manner that results in a constant effective interest rate being applied to the average carrying amount of the liability. The effective interest rate used to calculate accretion expense is our credit-adjusted, risk-free interest rate in effect at the time the liabilities were recorded. We review our calculations with respect to landfill asset retirement obligations at least annually. If there is a significant change in the facts and circumstances related to a landfill during the year, we will review our calculations for the landfill as soon as practical after the change has occurred. Landfill operating expenses Costs associated with daily maintenance activities and environmental compliance during the operating life of the landfill are expensed as incurred. These costs include, among other things, leachate treatment and disposal, methane gas and groundwater monitoring and systems maintenance, interim cap maintenance, costs associated with the application of daily cover materials, and the legal and administrative costs of ongoing environmental compliance. Environmental Liabilities We are subject to an array of laws and regulations relating to the protection of the environment, and we remediate sites in the ordinary course of our business. Under current laws and regulations, we may be responsible for environmental remediation at sites that we either own or operate, including sites that we have acquired, or sites where we have (or a company that we have acquired has) delivered waste. Our environmental remediation liabilities primarily include costs associated with remediating groundwater, surface water and soil contamination, as well as controlling and containing methane gas migration and the related legal costs. To estimate our ultimate liability at these sites, we evaluate several factors, including the nature and extent of contamination at each identified site, the required remediation methods, the apportionment of responsibility among the potentially responsible parties and the financial viability of those parties. We accrue for costs associated with environmental remediation obligations when such costs are probable and reasonably estimable in accordance with accounting for loss contingencies. We periodically review the status of all environmental matters and update our estimates of the likelihood of and future expenditures for remediation as necessary. Changes in the liabilities resulting from these reviews are recognized currently in earnings in the period in which the adjustment is known. Adjustments to estimates are reasonably possible in the near term and may result in changes to recorded amounts. With the exception of those obligations assumed in the acquisition of Allied that were recorded at estimated fair values, environmental obligations are recorded on an undiscounted basis. We have not reduced the liabilities we have recorded for recoveries from other potentially responsible parties or insurance companies.
Goodwill and Other Intangible Assets | Goodwill and Other Intangible Assets We annually test goodwill for impairment at December 31 or when an indicator of impairment exists. We test goodwill for impairment using the two-step process. The first step is a screen for potential impairment, while the second step measures the amount of the impairment, if any. The first step of the goodwill impairment test compares the fair value of a reporting unit with its carrying amount, including goodwill. We have defined our reporting units to be consistent with our operating segments: Eastern, Midwestern, Southern, and Western. In determining fair value, we primarily use discounted future cash flows and operating results based on a comparative multiple of earnings or revenues. Significant estimates used in our fair value calculation using discounted future cash flows include: (i) estimates of future revenue and expense growth by reporting unit, which we estimate to range from 2% to 4% annually; (ii) future estimated effective tax rates, which we estimate to be 40%; (iii) future estimated capital expenditures as well as future required investments in working capital; (iv) estimated discount rates, which we estimate to range between 7% and 8%; and (v) the future terminal value of the reporting unit, which is based on its ability to exist into perpetuity. Significant estimates used in the fair value calculation utilizing market value multiples include: (i) estimated future growth potential of the reporting unit; (ii) estimated multiples of revenue or earnings a willing buyer is likely to pay; and (iii) estimated control premium a willing buyer is likely to pay. In addition, we evaluate a reporting unit for impairment if events or circumstances change between annual tests, indicating a possible impairment. Examples of such events or circumstances include: (i) a significant adverse change in legal factors or in the business climate; (ii) an adverse action or assessment by a regulator; (iii) a more likely than not expectation that a reporting unit or a significant portion thereof will be sold; (iv) continued or sustained losses at a reporting unit; (v) a significant decline in our market capitalization as compared to our book value; or (vi) the testing for recoverability of a significant asset group within the reporting unit. We assign assets and liabilities from our corporate operating segment to our four reporting units to the extent that such assets or liabilities relate to the cash flows of the reporting unit and would be included in determining the reporting unit’s fair value. In preparing our annual test for impairment as of December 31, 2011, we determined that our indicated fair value of total invested capital exceeded our total market capitalization. We believe one of the primary reconciling differences between the indicated fair value of total invested capital and our total market capitalization is due to a control premium. We believe the control premium represents the value a market participant could extract as savings and / or synergies by obtaining control, and thereby eliminating duplicative overhead and operating costs resulting from the consolidation of routes and internalization of waste streams. As of December 31, 2011, we determined that the indicated fair value of our reporting units exceeded their carrying value by a range of 30% to approximately 60% and, therefore, we noted no indicators of impairment at our reporting units. We will continuously monitor market trends in our business, the related expected cash flows and our calculation of market capitalization for purposes of identifying possible indicators of impairment. If our book value per share exceeds our market price per share or if we have other indicators of impairment, we will be required to perform an interim step one impairment analysis, which may lead to a step two analysis and possible impairment of our goodwill. Additionally, we would then be required to review our remaining long-lived assets for impairment. Our operating segments, which also represent our reporting units, are comprised of several vertically integrated businesses. When an individual business within an integrated operating segment is divested, goodwill is allocated to that business based on its fair value relative to the fair value of its operating segment. Other intangible assets include values assigned to customer relationships, long-term contracts, covenants not to compete and trade names, and are amortized generally on a straight-line basis over periods ranging from 1 to 24 years.
Asset Impairments | Asset Impairments We continually consider whether events or changes in circumstances have occurred that may warrant revision of the estimated useful lives of our long-lived assets (other than goodwill) or whether the remaining balances of those assets should be evaluated for possible impairment. Long-lived assets include, for example, capitalized landfill costs, other property and equipment, and identifiable intangible assets. Events or changes in circumstances that may indicate that an asset may be impaired include the following:
| • |  | A significant decrease in the market price of an asset or asset group,
| • |  | A significant adverse change in the extent or manner in which an asset or asset group is being used or in its physical condition,
| • |  | A significant adverse change in legal factors or in the business climate that could affect the value of an asset or asset group, including an adverse action or assessment by a regulator,
| • |  | An accumulation of costs significantly in excess of the amount originally expected for the acquisition or construction of a long-lived asset,
| • |  | A current period operating or cash flow loss combined with a history of operating or cash flow losses or a projection or forecast that demonstrates continuing losses associated with the use of a long-lived asset or asset group,
| • |  | A current expectation that, more likely than not, a long-lived asset or asset group will be sold or otherwise disposed of significantly before the end of its previously estimated useful life, or
| • |  | An impairment of goodwill at a reporting unit.
There are certain indicators listed above that require significant judgment and understanding of the waste industry when applied to landfill development or expansion. For example, a regulator may initially deny a landfill expansion permit application though the expansion permit is ultimately granted. In addition, management may periodically divert waste from one landfill to another to conserve remaining permitted landfill airspace. Therefore, certain events could occur in the ordinary course of business and not necessarily be considered indicators of impairment due to the unique nature of the waste industry. If indicators of impairment exist, the asset or asset group is reviewed to determine whether its recoverability is impaired. We assess the recoverability of the asset or asset group by comparing its carrying value to an estimate (or estimates) of its undiscounted future cash flows over its remaining life. If the estimated undiscounted cash flows are not sufficient to recover the carrying value of the asset or asset group, we measure an impairment loss as the amount by which the carrying amount of the asset exceeds its fair value. The loss is recorded in the consolidated statement of income in the period in which such impairment is identified. Estimating future cash flows requires significant judgment, and our projections of future cash flows and remaining useful lives may vary materially from actual results.
Self-Insurance Reserves | Self-Insurance Reserves Our insurance programs for workers’ compensation, general liability, vehicle liability and employee-related health care benefits are effectively self-insured. Accruals for self-insurance reserves are based on claims filed and estimates of claims incurred but not reported. We consider our past claims experience, including both frequency and settlement amount of claims, in determining these estimates. It is possible that recorded reserves may not be adequate to cover the future payment of claims. Adjustments, if any, to estimates recorded resulting from ultimate claim payments will be reflected in the consolidated statements of income in the periods in which such adjustments are known. In general, our self-insurance reserves are recorded on an undiscounted basis. However, the self-insurance liabilities we acquired in the Allied acquisition have been recorded at estimated fair value, and, therefore, have been discounted to present value based on our estimate of the timing of the related cash flows. As we are the primary obligor for payment of all claims, we report our insurance claim liabilities on a gross basis in other current and long-term liabilities and any associated recoveries from our insurers are recorded in other assets.
Business Combinations | Business Combinations We acquire businesses in the waste industry, including non-hazardous waste collection, transfer station, materials recovery facilities and disposal operations, as part of our growth strategy. Businesses are included in the consolidated financial statements from the date of acquisition. We recognize, separately from goodwill, the identifiable assets acquired and liabilities assumed at their estimated acquisition-date fair values. We measure and recognize goodwill as of the acquisition date as the excess of: (i) the aggregate of the fair value of consideration transferred, the fair value of any noncontrolling interest in the acquiree (if any) and the acquisition-date fair value of our previously held equity interest in the acquiree (if any), over (ii) the fair value of assets acquired and liabilities assumed. If information about facts and circumstances existing as of the acquisition date is incomplete by the end of the reporting period in which a business combination occurs, we report provisional amounts for the items for which the accounting is incomplete. The measurement or allocation period ends once we receive the information we are seeking; however, this period will not exceed one year from the acquisition date. Any material adjustments recognized during the measurement period will be reflected retrospectively in the consolidated financial statements of the subsequent period. We will recognize third-party transaction related costs as expense currently in the period in which they are incurred.
Discontinued Operations | Discontinued Operations We analyze our operations that have been divested or classified as held-for-sale to determine if they qualify for discontinued operations accounting. Only operations that qualify as a component of an entity under U.S. GAAP can be included in discontinued operations. In addition, only components where we do not have significant continuing involvement with the divested operations would qualify for discontinued operations accounting. For our purposes, continuing involvement would include continuing to receive waste at our landfill or recycling facility from a divested hauling operation or transfer station or continuing to dispose of waste at a divested landfill or transfer station.
Costs Associated with Exit Activities | Costs Associated with Exit Activities We record costs associated with exit activities such as employee termination benefits that represent a one-time benefit when management approves and commits to a plan of termination, and communicates the termination arrangement to the employees, or over the future service period, if any. Other costs associated with exit activities may include contract termination costs, including costs related to leased facilities to be abandoned or subleased, and facility and employee relocation costs. In addition, we account for costs to exit an activity of an acquired company and involuntary employee termination benefits associated with acquired businesses in the purchase price allocation of the acquired business if a plan to exit an activity of an acquired company exists, and those costs have no future economic benefit to us and will be incurred as a direct result of the exit plan, or the exit costs represent amounts to be incurred by us under a contractual obligation of the acquired entity that existed prior to the acquisition date. We recognize employee termination benefits as liabilities assumed as of the acquisition date when management approves and commits to a plan of termination, and communicates the termination arrangement to the employees, if the future service period for these employees is less than sixty days from their date of notification.
Contingent Liabilities | Contingent Liabilities We are subject to various legal proceedings, claims and regulatory matters, the outcomes of which are subject to significant uncertainty. In general, we determine whether to disclose or accrue for loss contingencies based on an assessment of whether the risk of loss is remote, reasonably possible or probable and whether it can be reasonably estimated. We assess our potential liability relating to litigation and regulatory matters based on information available to us. Management’s assessment is developed based on an analysis of possible outcomes under various strategies. We accrue for loss contingencies when such amounts are probable and reasonably estimable. If a contingent liability is only reasonably possible, we disclose the potential range of the loss, if estimable. Contingent liabilities recorded in purchase accounting are recorded at their fair values. These fair values may be different from the values we would have otherwise recorded, had the contingent liability not been assumed as part of an acquisition of a business.
Accumulated Other Comprehensive Income | Accumulated Other Comprehensive Income Accumulated other comprehensive income is a component of stockholders’ equity and includes the effective portion of the net changes in fair value of our cash flow hedges which consist of prices for diesel fuel and recyclable materials, net of tax, settlement and amortization of our interest rate locks and certain adjustments to liabilities associated with our employee benefit plan liabilities, net of tax.
Revenue Recognition | Revenue Recognition We generally provide services under contracts with municipalities or individual customers. Municipal and commercial contracts are generally long-term and often have renewal options. Advance billings are recorded as deferred revenue, and revenue is recognized over the period services are provided. No single customer has individually accounted for more than 3% of our consolidated revenue or of our reportable segment revenue in any of the past three years. We recognize revenue when all four of the following criteria are met:
| • |  | Persuasive evidence of an arrangement exists such as a service agreement with a municipality, a hauling customer or a disposal customer,
| • |  | Services have been performed such as the collection and hauling of waste or the disposal of waste at a disposal facility we own or operate,
| • |  | The price of the services provided to the customer is fixed or determinable, and
| • |  | Collectibility is reasonably assured.
Income Taxes | Income Taxes We are subject to income taxes in the United States and Puerto Rico. We record deferred income taxes to reflect the effects of temporary differences between the carrying amounts of assets and liabilities and their tax bases using enacted tax rates that we expect to be in effect when the taxes are actually paid or recovered. We record net deferred tax assets to the extent we believe these assets will more likely than not be realized. In making these determinations, we consider all available positive and negative evidence, including scheduled reversals of deferred tax liabilities, tax planning strategies, projected future taxable income and recent financial operating results. If we determine that we would be able to realize a deferred income tax asset in the future in excess of its net recorded amount, we would make an adjustment to the valuation allowance which would reduce the provision for income taxes. A tax benefit from an uncertain tax position may be recognized when it is more likely than not that the position will be sustained upon examination, including resolutions of any related appeals or litigation processes, based on the technical merits. Income tax positions must meet a more-likely-than-not recognition threshold at the effective date to be recognized. We recognize interest and penalties related to uncertain tax positions in the provision for income taxes in the accompanying consolidated statements of income. Accrued interest and penalties are included in other accrued liabilities, and deferred income taxes and other long-term tax liabilities, in the consolidated balance sheets.
Defined Benefit Pension Plan | Defined Benefit Pension Plan We currently have one qualified defined pension plan, the BFI Retirement Plan (the Plan). The Plan covers certain current and former employees of Allied in the United States, including some employees subject to collective bargaining agreements. The Plan’s benefit formula is based on a percentage of compensation as defined in the Plan document. However, the benefits of approximately 97% of the current plan participants were frozen upon Allied’s acquisition of BFI in 1999. Our pension contributions are made in accordance with funding standards established by the Employee Retirement Income Security Act of 1974 (ERISA) and the Internal Revenue Code (IRC), as amended by the Pension Protection Act of 2006. The Plan’s assets have been invested as determined by our Retirement Benefits Committee. We annually review and adjust the Plan’s asset allocation as deemed necessary. The benefit obligation and associated income or expense related to the Plan are determined using annually established assumptions for discount rates, expected rates of return and average rates for compensation increases. We determine the discount rate based on a model that matches the timing and amount of expected benefit payments to maturities of high quality bonds priced as of the pension plan measurement date. When that timing does not correspond to a published high-quality bond rate, our model uses an expected yield curve to determine an appropriate current discount rate. The yields on the bonds are used to derive a discount rate for the liability. In developing our expected rate of return assumption, we evaluate long-term expected and historical actual returns on the plan assets, giving consideration to our asset mix and the anticipated duration of our plan obligations. The average rate of compensation increase reflects our expectations of average pay increases over the periods benefits are earned. Our assumptions are reviewed annually and adjusted as deemed necessary.
Equity-Based Compensation Plans | Equity-Based Compensation Plans We recognize equity-based compensation expense on the estimated fair value of stock options and similar equity instruments issued as compensation to employees over the requisite service periods. Cash flows resulting from tax benefits related to tax deductions in excess of those recorded for compensation expense, resulting from the exercise of stock options, are classified as cash flows from financing activities. All other tax benefits related to stock options have been presented as a component of cash flows from operating activities. We recognize compensation expense on a straight-line basis over the requisite service period for each separately vesting portion of the award, or to the employee’s retirement-eligible date, if earlier. The fair value of each option on the date of grant is estimated using a lattice binomial option-pricing model based on certain valuation assumptions. Expected volatilities are based on our historical stock prices over the contractual terms of the options and other factors. The risk-free interest rates are based on the published U.S. Treasury yield curve in effect at the time of the grant for instruments with a similar life. The dividend yield reflects our dividend yield at the date of grant. The expected life represents the period that the stock options are expected to be outstanding, taking into consideration the contractual terms of the options and our employees’ historical exercise and post-vesting employment termination behavior, weighted to reflect the job level demographic profile of the employees receiving the option grants. The estimated forfeiture rate used to record compensation expense is based on historical forfeitures and is adjusted periodically based on actual results.
Leases | Leases We lease property and equipment in the ordinary course of our business. Our most significant lease obligations are for property and equipment specific to our industry, including real property operated as a landfill or transfer station and operating equipment. Our leases have varying terms. Some may include renewal or purchase options, escalation clauses, restrictions, penalties or other obligations that we consider in determining minimum lease payments. The leases are classified as either operating leases or capital leases, as appropriate. Operating Leases Many of our leases are operating leases. This classification generally can be attributed to either (i) relatively low fixed minimum lease payments (including, for example, real property lease payments that are not fixed and vary based on the volume of waste we receive or process), or (ii) minimum lease terms that are much shorter than the assets’ economic useful lives. Management expects that, in the normal course of business, our operating leases will be renewed, replaced by other leases, or replaced with fixed asset expenditures. Capital Leases Assets acquired under capital leases are capitalized at the inception of each lease and are amortized to depreciation expense over the lesser of the useful life of the asset or the lease term on either a straight-line or a units-of-consumption basis, depending on the asset leased. The present value of the related lease payments is recorded as a debt obligation. Our capital lease liability relates primarily to certain long-term landfill operating agreements with minimum lease payments with offsetting capital lease assets recorded as part of the landfill development costs.
Related Party Transactions | Related Party Transactions It is our policy that transactions with related parties must be on terms that, on the whole, are no less favorable than those that would be available from unaffiliated parties.
New Accounting Pronouncements | New Accounting Pronouncements Other Comprehensive Income In June 2011, the FASB issued a new accounting standard update on the presentation of comprehensive income. The updated standard requires the presentation of comprehensive income, the components of net income and the components of other comprehensive income either in a single continuous statement of comprehensive income or in two separate but consecutive statements. The updated standard also requires presentation of adjustments for items that are reclassified from other comprehensive income to net income in the statement where the components of net income and the components of other comprehensive income are presented. The FASB deferred certain portions of the accounting standard update related to presentation of reclassification adjustments from other comprehensive income to net income. We have early adopted this presentation standard as of December 31, 2011. The adoption of this guidance did not have an impact our consolidated financial position, or results of operations, or cash flows.

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- Definition Disclosure of accounting policy for any discontinued operations. The results of operations of a component of an entity that either has been disposed of or is classified as held for sale is reported in discontinued operations if both: (a) the operations and cash flows of the component have been (or will be) eliminated from the ongoing operations of the entity as a result of the disposal transaction and (b) the entity will not have any significant continuing involvement in the operations of the component after the disposal transaction. If the entity elects to allocate interest expense to a discontinued operation, it may disclose its accounting policy for this election and describe its method of allocation. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=6367646&loc=d3e18780-107790 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 205 -SubTopic 20 -Section S99 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=6361211&loc=d3e7436-122677 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Emerging Issues Task Force (EITF) -Number 03-13 -Paragraph 17 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 205 -SubTopic 20 -URI http://asc.fasb.org/subtopic&trid=2122178 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Emerging Issues Task Force (EITF) -Number 87-24 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 144 -Paragraph 41, 42, 43, 44 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. + Details
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- Definition Disclosure of accounting policy for investments in financial assets, including marketable securities (debt and equity securities with readily determinable fair values), investments accounted for under the equity method and cost method, securities borrowed and loaned, and repurchase and resale agreements. For marketable securities, the disclosure may include the entity's accounting treatment for transfers between investment categories and how the fair values for such securities are determined. Also, for all investments, an entity may describe its policy for assessing, recognizing and measuring impairment of the investment. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=6367646&loc=d3e18780-107790 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.2,12) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name FASB Staff Position (FSP) -Number FAS115-1/124-1 -Paragraph 7-18 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 6 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6872113&loc=d3e27290-111563 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 107 -Paragraph 10, 11 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 323 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=6382943&loc=d3e33918-111571 Reference 7: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 5 -Section M Reference 8: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 325 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6872867&loc=d3e40691-111596 Reference 9: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 2, 12 -Article 5 Reference 10: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 115 -Paragraph 7-16 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 11: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 10 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6947722&loc=d3e13433-108611 + Details
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- Definition Disclosure of accounting policy for pension and other postretirement benefit plans. 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- Definition Disclosure of accounting policy for property, plant and equipment which may include the basis of such assets, depreciation methods used and estimated useful lives, the entity's capitalization policy, including its accounting treatment for costs incurred for repairs and maintenance activities, whether such asset balances include capitalized interest and the method by which such is calculated, how disposals of such assets are accounted for and how impairment of such assets is assessed and recognized. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=6367646&loc=d3e18780-107790 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 13 -Subparagraph a -Article 5 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Principles Board Opinion (APB) -Number 12 -Paragraph 5 -Subparagraph d -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.13(a)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Principles Board Opinion (APB) -Number 22 -Paragraph 12, 13 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -URI http://asc.fasb.org/subtopic&trid=2155824 Reference 7: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 144 -Paragraph 7 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 8: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Research Bulletin (ARB) -Number 43 -Chapter 9 -Section C -Paragraph 5 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 9: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 34 -Paragraph 8, 9 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. + Details
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- Definition Disclosure of accounting policy for trade and other accounts receivable, and finance, loan and lease receivables, including those classified as held for investment and held for sale. This disclosure may include (1) the basis at which such receivables are carried in the entity's statements of financial position (2) how the level of the valuation allowance for receivables is determined (3) when impairments, charge-offs or recoveries are recognized for such receivables (4) the treatment of origination fees and costs, including the amortization method for net deferred fees or costs (5) the treatment of any premiums or discounts or unearned income (6) the entity's income recognition policies for such receivables, including those that are impaired, past due or placed on nonaccrual status and (7) the treatment of foreclosures or repossessions (8) the nature and amount of any guarantees to repurchase receivables. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 3-5 -Article 5 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=6367646&loc=d3e18780-107790 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 114 -Paragraph 20 -Subparagraph b -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -URI http://asc.fasb.org/subtopic&trid=2196772 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Emerging Issues Task Force (EITF) -Number 92-5 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Statement of Position (SOP) -Number 01-6 -Paragraph 13 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 7: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 20 -URI http://asc.fasb.org/subtopic&trid=2196816 + Details
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