XML 35 R22.htm IDEA: XBRL DOCUMENT
v3.10.0.1

Nature of Operations and Summary of Significant Accounting Policies (Policies) | 12 Months Ended
--- | ---
Dec. 31, 2018
Nature of Operations and Summary of Significant Accounting Policies |
Basis of Presentation | Basis of Presentation The Company’s consolidated financial statements include the accounts of the Company and the SkyWest Airlines, ExpressJet and SkyWest Leasing segments, with all inter‑company transactions and balances having been eliminated. In preparing the accompanying consolidated financial statements, the Company has reviewed, as determined necessary by the Company’s management, events that have occurred after December 31, 2018, through the filing date of the Company’s annual report with the U.S. Securities and Exchange Commission. The Company reclassified certain prior period amounts to conform to the current period presentation (see Recent Accounting Pronouncements).
Use of Estimates | Use of Estimates The preparation of financial statements in conformity with accounting principles generally accepted in the United States requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities and disclosure of contingent assets and liabilities at the date of the financial statements and the reported amounts of revenues and expenses during the reporting period. Actual results could differ from those estimates.
Cash and Cash Equivalents | Cash and Cash Equivalents The Company considers all highly liquid investments with an original maturity of three months or less to be cash equivalents. The Company had no restricted cash as of December 31, 2018 and 2017.
Marketable securities | Marketable Securities The Company’s investments are classified as available-for-sale and are reported at fair market value with the net unrealized appreciation reported as a component of accumulated other comprehensive income (loss) in stockholders’ equity. At the time of sale, any realized appreciation or depreciation, calculated by the specific identification method, is recognized in other income and expense. The Company’s position in marketable securities as of December 31, 2018 and 2017 was as follows (in thousands):
|  |  |  |  | Gross unrealized |  | Gross unrealized |  |  |  |
At December 31, 2018 |  | Amortized Cost |  | holding gains |  | holding losses |  | Fair market value |
Total cash and cash equivalents |  | $ | 328,384 |  | $ | — |  | $ | — |  | $ | 328,384 |
Marketable securities: |  |  |  |  |  |  |  |  |  |  |  |  |
Bond and bond funds |  | $ | 229,825 |  | $ | — |  | $ | (42) |  | $ | 229,783 |
Commercial Paper |  |  | 131,163 |  |  | — |  |  | (1) |  |  | 131,162 |
Total marketable securities |  | $ | 360,988 |  | $ | — |  | $ | (43) |  | $ | 360,945 |
Total assets measured at fair value |  | $ | 689,372 |  | $ | — |  | $ | (43) |  | $ | 689,329 |
|  |  |  |  | Gross unrealized |  |  | Gross unrealized |  |  |  |
At December 31, 2017 |  | Amortized Cost |  | holding gains |  | holding losses |  | Fair market value |
Total cash and cash equivalents |  | $ | 181,792 |  | $ | — |  | $ | — |  | $ | 181,792 |
Marketable securities: |  |  |  |  |  |  |  |  |  |  |  |  |
Bond and bond funds |  | $ | 344,479 |  | $ | — |  | $ | (228) |  | $ | 344,251 |
Commercial Paper |  |  | 159,252 |  |  | — |  |  | — |  |  | 159,252 |
Total marketable securities |  | $ | 503,731 |  | $ | — |  | $ | (228) |  | $ | 503,503 |
Total assets measured at fair value |  | $ | 685,523 |  | $ | — |  | $ | (228) |  | $ | 685,295 |
As of December 31, 2018 and 2017, the Company had classified $360.9 million and $503.5 million of marketable securities, respectively, as short‑term since it had the ability to redeem the securities within one year.
Inventories | Inventories Inventories include expendable parts, fuel and supplies and are valued at cost (FIFO basis) less an allowance for obsolescence based on historical results, excess parts and management’s expectations of future operations. Expendable inventory parts are charged to expense as used. An obsolescence allowance for flight equipment expendable parts is accrued based on estimated lives of the corresponding fleet types and salvage values. The inventory allowance as of December 31, 2018 and 2017 was $22.1 million and $17.1 million, respectively. These allowances are based on management estimates.
Property and Equipment | Property and Equipment Property and equipment are stated at cost and depreciated over their useful lives to their estimated residual values using the straight‑line method as follows:
Assets |  | Depreciable Life |  | Current Residual Value |
Aircraft, rotable spares, and spare engines |  | up to 22 years |  | up to 20 | % |
Ground equipment |  | up to 10 years |  | 0 | % |
Office equipment |  | up to 7 years |  | 0 | % |
Leasehold improvements |  | Shorter of 15 years or lease term |  | 0 | % |
Buildings |  | 20 - 39.5 years |  | 0 | % |
Impairment of Long-Lived Assets | Impairment of Long-Lived Assets As of December 31, 2018, the Company had approximately $5.0 billion of property and equipment and related assets. In accounting for these long‑lived and intangible assets, the Company makes estimates about the expected useful lives of the assets, the expected residual values of certain of these assets, and the potential for impairment based on the fair value of the assets and the cash flows they generate. Factors indicating potential impairment include, but are not limited to, significant decreases in the market value of the long‑lived assets, a significant change in the condition of the long‑lived assets and operating cash flow losses associated with the use of the long‑lived assets. On a periodic basis, the Company evaluates whether impairment indicators are present. When considering whether or not impairment of long‑lived assets exists, the Company groups similar assets together at the lowest level for which identifiable cash flows are largely independent of the cash flows of other assets and liabilities and compare the undiscounted cash flows for each asset group to the net carrying amount of the assets supporting the asset group. Asset groupings are done at the fleet or contract level. The Company did not recognize any impairment charges of long-lived assets during the years ended December 31, 2018 and 2017. During the year ended December 31, 2016, the Company impaired certain long-lived assets relating to the CRJ200 aircraft and ERJ145 aircraft type specific assets. See Note 7, Special Items.
Capitalized Interest | Capitalized Interest Interest is capitalized on aircraft purchase deposits as a portion of the cost of the asset and is depreciated over the estimated useful life of the asset. During the years ended December 31, 2018, 2017 and 2016, the Company capitalized interest costs of approximately $1.5 million, $1.4 million, and $1.5 million, respectively.
Maintenance | Maintenance The Company operates under a U.S. Federal Aviation Administration approved continuous inspection and maintenance program. The Company uses the direct expense method of accounting for its regional jet engine overhauls wherein the expense is recorded when the overhaul event occurs. The Company has engine services agreements with third-party vendors to provide long-term engine services covering the scheduled and unscheduled repairs for most of its CRJ200 aircraft, CRJ700 aircraft, ERJ145 aircraft and E175 aircraft. Under the terms of the agreements, the Company pays a fixed dollar amount per engine hour flown on a monthly basis and the third-party vendors will assume the responsibility to repair the engines at no additional cost to the Company, subject to certain specified exclusions. Maintenance costs under these contracts are recognized when the engine hour is flown pursuant to the terms of each contract. The costs of maintenance for airframe and avionics components, landing gear and other recurring maintenance are expensed as incurred.
Flying Agreements and Airport Customer Service and Other Revenues | Flying Agreements and Airport Customer Service and Other Revenues In May 2014, the Financial Accounting Standards Board (the “FASB”) issued Accounting Standards Update No. 2014‑09, “Revenue from Contracts with Customers, (Topic 606)” (“Topic 606”). Under Topic 606, revenue is recognized at the time a good or service is transferred to a customer for the amount of consideration received for that specific good or service. The Company adopted this standard as of January 1, 2018, utilizing the full retrospective method of adoption allowed by the standard, in order to provide for comparative results in all periods presented. Under the new standard, the Company concluded that the individual flights are distinct services and the flight services promised in a capacity purchase agreement represent a series of services that should be accounted for as a single performance obligation, recognized over time as the flights are completed. Performance obligations are deemed met upon the completion of each individual flight. The major airline partners make provisional cash payments to the Company during each month of service based on monthly flight schedules and the provisional cash payments are reconciled based on actual completed flights after each month’s flight activity is completed. The compensation associated with the use of the aircraft under the Company’s fixed-fee agreements is considered lease revenue as the agreements identify the “right of use” of a specific type and number of aircraft over the agreement term and was not impacted by the adoption of ASC 606. The adoption of Topic 606 did not have a material impact on recorded amounts when applied to the opening balance sheet as of January 1, 2018. The adoption of Topic 606 only affected the Company’s consolidated balance sheets and statements of comprehensive income classification, with no impact on the Company’s operating income (loss), net income (loss), earnings (loss) per share or cash flows, however the principal versus agent considerations under Topic 606 resulted in the Company recording directly reimbursed fuel expense under its fixed-fee contracts as a reduction to the applicable operating expense (net) rather than revenue (gross). This classification change resulted in a reduction to total revenue and a reduction to operating expenses by the same amount, resulting in no change to operating income. Additionally, under the nonrefundable up-front fees and contract costs considerations of Topic 606, reimbursements from the Company’s major airline partners for up-front contract costs will be deferred and amortized over the contract term. The related up-front costs to obtain the contract will also be capitalized and amortized over the contract term. As the amount of the up-front reimbursement is determined from the Company’s actual costs to fulfill the contract, this change did not impact the Company’s operating income (loss) as the amount of deferred revenue and the amount of capitalized costs will be recognized over the same period. This change also resulted in a deferred revenue liability and a capitalized contract cost on the balance sheet of the same amount. The Company recognizes flying agreements and airport customer service and other revenues when the service is provided under its code-share agreements. Under the Company’s fixed-fee arrangements (referred to as “fixed-fee arrangements, “fixed-fee contracts” or “capacity purchase agreements”) with Delta, United, American and Alaska (each, a “major airline partner”), the major airline partner generally pays the Company a fixed-fee for each departure, flight hour (measured from takeoff to landing, excluding taxi time) or block hour (measured from takeoff to landing, including taxi time) incurred, and an amount per aircraft in service each month with additional incentives based on flight completion and on-time performance. The major airline partner also directly reimburses the Company for certain direct expenses incurred under the fixed-fee arrangement, such as airport landing fees and airport rents. Under the fixed-fee arrangements, revenue is earned when each flight is completed and is reflected in flying agreements revenue. The transaction price for the fixed-fee agreements is determined from the fixed-fee consideration, incentive consideration and directly reimbursed expenses earned as flights are completed over the agreement term. A portion of the Company’s compensation under its fixed-fee agreements is designed to reimburse the Company for certain aircraft ownership costs. The consideration for aircraft ownership costs varies by agreement, but is intended to cover either the Company’s aircraft principal and interest debt service costs, its aircraft depreciation and interest expense or its aircraft lease expense costs while the aircraft is under contract. The consideration received for the use of the aircraft under the Company’s fixed-fee agreements is reflected as lease revenue, inasmuch as the agreements identify the “right of use” of a specific type and number of aircraft over a stated period of time. The amount of compensation deemed to be lease revenue is determined from the agreed upon rates for the use of aircraft included each fixed-fee agreement. The lease revenue associated with the Company’s fixed-fee agreements is accounted for as an operating lease and is reflected as flying agreements revenue on the Company’s consolidated statements of comprehensive income. For the year ended December 31, 2018, fixed-fee arrangements represented approximately 84.3% of the Company’s flying agreements revenue. Under the Company’s revenue-sharing arrangements (referred to as a “revenue-sharing” or “prorate” arrangement), the major airline partner and the Company negotiate a passenger fare proration formula, pursuant to which the Company receives a percentage of the ticket revenues for those passengers traveling for one portion of their trip on a Company airline and the other portion of their trip on the major airline partner. Revenue is recognized under the Company’s prorate flying agreements when each flight is completed based upon the portion of the prorate passenger fare the Company anticipates that it will receive for each completed flight. The transaction price for the prorate agreements is determined from the proration formula derived from each passenger ticket amount on each completed flight over the agreement term. For the year ended December 31, 2018, prorate flying arrangements represented approximately 15.7% of the Company’s flying agreements revenue. In the event that the contractual rates under the agreements have not been finalized at quarterly or annual financial statement dates, the Company records revenues based on the lower of prior period’s approved rates, as adjusted to reflect any contract negotiations and the Company’s estimate of rates that will be implemented in accordance with revenue recognition guidelines. In the event the Company has a reimbursement dispute with a major airline partner, the Company evaluates the dispute under Topic 606 and, provided the revenue recognition criteria have been met, the Company recognizes revenue based on management’s estimate of the resolution of the dispute subject to the variable constraint guidance under Topic 606. Other ancillary revenues commonly associated with airlines, such as baggage fee revenue, ticket change fee revenue and the marketing component of the sale of mileage credits, are retained by the Company’s major airline partners on flights that the Company operates under its code‑share agreements. The following table represents the Company’s flying agreements revenue by type for the year ended December 31, 2018 and 2017 (in thousands):
|  | For the year ended December 31,
|  | 2018 |  | 2017 |  | 2016
Capacity purchase agreements revenue: flight operations |  | $ | 1,856,253 |  | $ | 1,805,510 |  | $ | 1,792,868
Capacity purchase agreements revenue: aircraft lease |  |  | 814,518 |  |  | 834,366 |  |  | 763,406
Prorate agreements revenue |  |  | 498,749 |  |  | 438,421 |  |  | 454,464
Flying agreements revenue |  | $ | 3,169,520 |  | $ | 3,078,297 |  | $ | 3,010,738
The Company’s fixed-fee and prorate agreements include weekly provisional cash payments from the respective major airline partner based on a projected level of flying each month. The Company and each major airline partner subsequently reconcile these payments to the actual completed flight activity on a monthly or quarterly basis. In the event a flying agreement includes a mid-term rate reset to adjust rates prospectively and the contractual rates under the Company’s flying agreements have not been finalized at quarterly or annual financial statement dates, the Company applies the variable constraint guidance under Topic 606, where the Company records revenue to the extent it believes that it is probable that a significant reversal in the amount of cumulative revenue recognized will not occur when the uncertainty associated with the variable consideration is subsequently resolved. In several of the Company’s agreements, the Company is eligible to receive incentive compensation upon the achievement of certain performance criteria. The incentives are defined in the agreements and are measured and determined on a monthly, quarterly or semi‑annual basis. At the end of each period during the term of an agreement, the Company calculates the incentives achieved during that period and recognizes revenue attributable to that agreement accordingly, subject to the variable constraint guidance under Topic 606. The following summarizes the significant provisions of each code-share agreement the Company has with each major airline partner through SkyWest Airlines: Delta Connection Agreements
Agreement |  | Aircraft type |  | Number of Aircraft |  | Term / Termination Dates |
Delta Connection Agreement (fixed-fee arrangement) |  | CRJ 200 CRJ 700 CRJ 900 E175 |  | 58 22 41 49 |  | Individual aircraft have scheduled removal dates from 2019 to 2029 The average remaining term of the aircraft under contract is 4.1 years |
Delta Connection Prorate Agreement (revenue-sharing arrangement) |  | CRJ 200 |  | 29 |  | Terminable with 30-day notice |
United Express Agreements
Agreement |  | Aircraft type |  | Number of Aircraft |  | Term / Termination Dates |
United Express Agreements (fixed-fee arrangement) |  | CRJ 200 CRJ 700 E175 |  | 65 19 65 |  | Individual aircraft have scheduled removal dates under the agreement between 2019 and 2029 The average remaining term of the aircraft under contract is 7.0 years |
United Express Prorate Agreement (revenue-sharing arrangement) |  | CRJ 200 |  | 25 |  | Terminable with 120-day notice |
American Agreements
Agreement |  | Aircraft type |  | Number of Aircraft |  | Term / Termination Dates |
American Agreement (fixed-fee arrangement) |  |  CRJ 700 |  | 58 |  |  Individual aircraft have scheduled removal dates from 2019 to 2023 |
American Prorate Agreement (revenue-sharing arrangement) |  |  CRJ 200 |  | 7 |  |  Terminable with 120-day notice |
Alaska Capacity Purchase Agreement
Agreement |  | Aircraft type |  | Number of Aircraft |  | Term / Termination Dates |
Alaska Agreement (fixed-fee arrangement) |  | E175 |  | 32 |  |  Individual aircraft have scheduled removal dates from 2027 to 2030 |
The following summarizes the code-share agreement activity the Company had with each major airline partner through ExpressJet Airlines: As of December 31, 2018, ExpressJet operated 100 ERJ145 aircraft and 16 CRJ200 aircraft under fixed-fee agreements with United, and 10 CRJ700 aircraft under a fixed-fee agreement with American. ExpressJet’s fixed-fee agreements with United and American were terminated in connection with our sale of ExpressJet in January 2019. ExpressJet also completed the wind down of its flying agreement with Delta by the end of 2018. The Company sold ExpressJet subsequent to December 31, 2018, however the Company retained ownership of the 16 CRJ200 aircraft and the 10 CRJ700 aircraft operated by ExpressJet as of December 31, 2018. The Company agreed to lease the 16 CRJ200 aircraft to ExpressJet for up to a five-year period. The Company is pursuing alternative uses of the 10 CRJ700 aircraft including, but not limited to, using the aircraft under fixed-fee agreements under a short-term basis or leasing the aircraft or aircraft engines to third parties. See Note 12, Subsequent Events, for additional information regarding the sale of ExpressJet. In addition to the contractual arrangements described above, SkyWest Airlines has entered into fixed-fee agreements with Alaska and Delta to place additional E175 aircraft into service for those major airline partners. As of December 31, 2018, the Company anticipated placing an additional three E175 aircraft with Alaska and nine E175 aircraft with Delta. The delivery dates for the new E175 aircraft are currently scheduled to take place by the end 2021. Final delivery dates may adjust based on various factors. SkyWest Airlines also entered into an agreement with Delta in the second quarter of 2018 to operate 20 CRJ900 aircraft under a fixed-fee agreement. As of December 31, 2018, SkyWest Airlines took delivery of five of these CRJ900 aircraft and placed the aircraft into service with Delta. The delivery dates for the remaining 15 aircraft are expected to continue through the end of 2020. These aircraft will replace 20 CRJ700 aircraft scheduled to expire under SkyWest’s flying contracts with Delta. When an aircraft is scheduled to be removed from a fixed-fee arrangement, the Company may, as practical under the circumstances, negotiate an extension with the respective major airline partner, negotiate the placement of the aircraft with another major airline partner, return the aircraft to the lessor if the aircraft is leased and the lease is expiring, place owned aircraft for sale, or pursue other uses for the aircraft. Other uses for the aircraft may include placing the aircraft in a prorate arrangement, leasing the aircraft to a third party or parting out the aircraft to use the engines and parts as spare inventory or to lease the engines to a third party. Airport customer service and other revenues primarily consist of ground handling functions, such as gate and ramp agent services at applicable airports where the Company provides such services. The transaction price for airport service agreements is determined from an agreed-upon rate by location applied to the applicable number of flights handled (measured by departures) by the Company over the agreement term. The Company’s operating revenues could be impacted by a number of factors, including changes to the Company’s code-share agreements with its major airline partners, contract modifications resulting from contract renegotiations, the Company’s ability to earn incentive payments contemplated under the Company’s code-share agreements and settlement of reimbursement disputes with the Company’s major airline partners.
Deferred Aircraft Credits | Deferred Aircraft Credits The Company accounts for incentives provided by aircraft manufacturers as deferred credits. The deferred credits related to leased aircraft are amortized on a straight‑line basis as a reduction to rent expense over the lease term. Credits related to owned aircraft reduce the purchase price of the aircraft, which has the effect of amortizing the credits on a straight‑line basis as a reduction in depreciation expense over the life of the related aircraft. The incentives are credits that may be used to purchase spare parts and pay for training and other expenses.
Income Taxes | Income Taxes The Company recognizes a net liability or asset for the deferred tax consequences of all temporary differences between the tax basis of assets and liabilities and their reported amounts in the consolidated financial statements that are expected to result in taxable or deductible amounts in future years when the reported amounts of the assets and liabilities are recovered or settled.
Net Income (Loss) Per Common Share | Net Income (Loss) Per Common Share Basic net income (loss) per common share (“Basic EPS”) excludes dilution and is computed by dividing net income (loss) by the weighted average number of common shares outstanding during the period. Diluted net income (loss) per common share (“Diluted EPS”) reflects the potential dilution that could occur if stock options or other contracts to issue common stock were exercised or converted into common stock. The computation of Diluted EPS does not assume exercise or conversion of securities that would have an anti‑dilutive effect on net income (loss) per common share. During the year ended December 31, 2018, 207,000 performance share units (at target performance) were excluded in the computation of Diluted EPS since the Company had not achieved the minimum target thresholds as of December 31, 2018. During the year ended December 31, 2017, 284,000 performance share units (at target performance) were excluded in the computation of Diluted EPS since the Company had not achieved the minimum target thresholds as of December 31, 2017. During the year ended December 31, 2016, 2,077,000 shares reserved for the issuance upon the exercise of outstanding options, performance shares and restricted stock units were excluded from the computation of Diluted EPS due to the net loss in 2016. The calculation of the weighted average number of common shares outstanding for Basic EPS and Diluted EPS are as follows for the years ended December 31, 2018, 2017 and 2016 (in thousands):
|  | Year Ended December 31,
|  | 2018 |  | 2017 |  | 2016 |
Numerator: |  |  |  |  |  |  |  |  |  |
Net Income (Loss) |  | $ | 280,372 |  | $ | 428,907 |  | $ | (161,586) |
Denominator: |  |  |  |  |  |  |  |  |  |
Basic earnings per share weighted average shares |  |  | 51,914 |  |  | 51,804 |  |  | 51,505 |
Dilution due to stock options and restricted stock units |  |  | 957 |  |  | 1,296 |  |  | — |
Diluted earnings per share weighted average shares |  |  | 52,871 |  |  | 53,100 |  |  | 51,505 |
Basic earnings (loss) per share |  | $ | 5.40 |  | $ | 8.28 |  | $ | (3.14) |
Diluted earnings (loss) per share |  | $ | 5.30 |  | $ | 8.08 |  | $ | (3.14) |
Comprehensive Income (Loss) | Comprehensive Income (Loss) Comprehensive income (loss) includes charges and credits to stockholders’ equity that are not the result of transactions with the Company’s shareholders, including changes in unrealized appreciation on marketable securities.
Fair Value of Financial Instruments | Fair Value of Financial Instruments The carrying amounts reported in the consolidated balance sheets for receivables and accounts payable approximate fair values because of the immediate or short‑term maturity of these financial instruments. Marketable securities are reported at fair value based on market quoted prices in the consolidated balance sheets. If quoted prices in active markets are no longer available, the Company has estimated the fair values of these securities utilizing a discounted cash flow analysis as of December 31, 2018. These analyses consider, among other items, the collateralization underlying the security investments, the creditworthiness of the counterparty, the timing of expected future cash flows, and the expectation of the next time the security is expected to have a successful auction. The fair value of the Company’s long‑term debt is estimated based on current rates offered to the Company for similar debt and was approximately $3,157.3 million as of December 31, 2018, as compared to the carrying amount of $3,185.4 million as of December 31, 2018. The Company’s fair value of long‑term debt as of December 31, 2017 was $2,698.4 million as compared to the carrying amount of $2,712.4 million as of December 31, 2017.
Segment Reporting | Segment Reporting Generally accepted accounting principles require disclosures related to components of a company for which separate financial information is available to, and regularly evaluated by, the Company’s chief operating decision maker when deciding how to allocate resources and in assessing performance. The Company’s three operating segments consist of the operations conducted by SkyWest Airlines, ExpressJet and SkyWest Leasing. Information pertaining to the Company’s reportable segments is presented in Note 2, Segment Reporting.
Recent Accounting Pronouncements | Recent Accounting Pronouncements Standards Effective in Future Years and Not Yet Adopted In February 2016, the FASB issued Accounting Standards Update 2016‑02, “Leases (Topic 842)” (“Topic 842”). Topic 842 amends the existing accounting standards for lease accounting, including requiring lessees to recognize most leases on their balance sheets and making targeted changes to lessor accounting. Topic 842 became effective beginning in the first quarter of 2019. In July 2018, the FASB issued ASU No. 2018-11, “Targeted Improvements - Leases (Topic 842).” This update provides an optional transition method that allows entities to elect to apply the standard prospectively at its effective date, versus recasting the prior periods presented. The Company anticipates electing this adoption method and expects to recognize a cumulative-effect adjustment to the opening balance of retained earnings in the period of adoption. Lease payments will include fixed and in-substance fixed payments, variable payments based on an index or rate, reasonably certain purchase options, termination penalties, and probable amounts the lessee will owe under a residual value guarantee. Lease payments will not include variable lease payments other than those that depend on an index or rate, any guarantee by the lessee of the lessor’s debt, or any amount allocated to non-lease components. Based on the Company’s initial assessment, the adoption of Topic 842 will significantly increase the Company’s assets and liabilities primarily to reflect its aircraft operating lease liability and related right-of-use asset. As of December 31, 2018, the Company had 260 leased aircraft under operating leases in its fleet. The Company also has operating leases related to terminal operations space and other real estate leases. The Company does not expect the adoption of the New Lease Standard to impact any of its existing debt covenants. Additionally, the Company does not expect the adoption to have a significant impact on the recognition, measurement or presentation of lease revenue and lease expenses within the condensed consolidated statements of operations and comprehensive income or the condensed consolidated statements of cash flows. The Company does not anticipate the adoption of Topic 842 will have a material impact on the timing or amount of the Company’s lease revenue as a lessor. The Company adopted Topic 842 on January 1, 2019. The Company expects to elect the several practical expedients available under the transition provisions of Topic 842, including (i) not reassessing whether expired or existing contracts contain leases, (ii) lease classification, and (iii) not revaluing initial direct costs for existing leases. Also, the Company plans to elect the practical expedient which will allow aggregation of non-lease components with the related lease components when evaluating accounting treatment. Lastly, the Company currently plans to apply the modified retrospective adoption method, utilizing the simplified transition option available in Topic 842, which allows entities to continue to apply the legacy guidance in ASC 840, including its disclosure requirements, in the comparative periods presented in the year of adoption. Upon adoption, the Company anticipates it will reflect a lease liability in the range of $450 to $500 million and a right-of-use asset of $600 to $650 million. Upon adoption, the right-of-use asset is expected to include prepaid aircraft rents, accrued aircraft rents and deferred rent credits that were separately stated in the Company’s December 31, 2018 balance sheet. These estimates are subject to revision based upon the Company’s adoption of Topic 842 in 2019. Recently Adopted Standards The Company adopted Topic 606 as of January 1, 2018, utilizing the full retrospective method of adoption allowed by the standard, in order to provide for comparative results in all periods presented. The adoption of Topic 606 did not have a material impact on recorded amounts when applied to the opening balance sheet as of January 1, 2018. The adoption of Topic 606 only affected the Company’s consolidated balance sheets and statements of comprehensive income classification, with no impact on the Company’s operating income (loss), net income (loss), earnings (loss) per share or cash flows, however the principal versus agent considerations under Topic 606 resulted in the Company recording directly reimbursed fuel expense under its fixed-fee contracts as a reduction to the applicable operating expense (net) rather than revenue (gross). This classification change resulted in a reduction to total revenue and a reduction to operating expenses by the same amount, resulting in no change to operating income. Additionally, under the nonrefundable up-front fees and contract costs considerations of Topic 606, reimbursements from the Company’s major airline partners for up-front contract costs will be deferred and amortized over the contract term. The related up-front costs to obtain the contract will also be capitalized and amortized over the contract term. As the amount of the up-front reimbursement is determined from the Company’s actual costs to fulfill the contract, this change did not impact the Company’s operating income (loss) as the amount of deferred revenue and the amount of capitalized costs will be recognized over the same period. This change also resulted in a deferred revenue liability and a capitalized contract cost on the balance sheet of the same amount. Prior to the Company’s adoption of Topic 606, the Company segregated its revenue into two categories: “Passenger revenue” and “Ground handling and other revenue.” “Passenger revenue” included revenue from fixed-fee contracts, prorate flying agreements and airport customer service agreements for flights operated by the Company. “Ground handling and other revenue” included revenue from airport customer service agreements for flights operated by third parties and other revenue. Under the disaggregated revenue disclosure considerations in Topic 606, the Company segregated its revenue into the following categories: “Flying agreements revenue” and “Airport customer service and other revenues.” “Flying agreements revenue” includes revenue from fixed-fee contracts, prorate flying agreements and other revenue (primarily lease revenue for the use of the aircraft). “Airport customer service and other revenues” includes revenue from airport customer services agreements. This change reclassifies amounts previously reported as “Passenger revenue” and “Ground handling and other revenue”. Additionally, in connection with the Company’s adoption of Topic 606, the Company renamed the operating expense “Ground handling services” to “Airport-related expenses.” Certain airport-related expenses, such as landing fees and airport facility rents, were previously reported as “Other operating expenses” and have been reclassified as “Airport-related expenses.” In 2016, the FASB issued Accounting Standards Update 2016‑15, “Statement of Cash Flows (Topic 230): Classification of Certain Cash Receipts and Cash Payments” and Accounting Standard Update 2016‑18, “Statement of Cash Flows (Topic 230): Restricted Cash” related to the classification of certain cash receipts and cash payments and the presentation of restricted cash within an entity’s statement of cash flows, respectively. These standards are effective for interim and annual reporting periods beginning after December 15, 2017. The Company adopted this standard in the first quarter of 2018 and modified the presentation to include changes in restricted cash in the Company’s Consolidated Statement of Cash Flows, which had an immaterial impact. Impact of Recently Adopted Standards The Company recast certain prior period amounts to conform with the adoption of Topic 606, as shown in the tables below (in thousands):
|  | Year ended December 31, 2017
Income Statement: |  | Previously Reported |  | Adjustments |  | As Adjusted
OPERATING REVENUES: |  |  |  |  |  |  |  |  |
Flying agreements (1) |  | $ | 3,126,708 |  | $ | (48,411) |  | $ | 3,078,297
Airport customer service and other (2) |  |  | 77,560 |  |  | (33,265) |  |  | 44,295
Total operating revenues |  | $ | 3,204,268 |  | $ | (81,676) |  | $ | 3,122,592
OPERATING EXPENSES: |  |  |  |  |  |  |  |  |
Salaries, wages and benefits |  | $ | 1,196,227 |  | $ | (4,160) |  | $ | 1,192,067
Aircraft fuel |  |  | 162,653 |  |  | (77,517) |  |  | 85,136
Airport-related expenses (3) |  |  | 69,848 |  |  | 48,526 |  |  | 118,374
Other operating expenses |  |  | 299,303 |  |  | (48,525) |  |  | 250,778
Total operating expenses |  |  | 2,816,069 |  |  | (81,676) |  |  | 2,734,393
OPERATING INCOME |  | $ | 388,199 |  | $ | — |  | $ | 388,199
| 1. |  | In previously reported periods, this line item was presented as passenger revenue.
| 2. |  | In previously reported periods, this line item was presented as ground handling and other.
| 3. |  | In previously reported periods, this line item was presented as ground handling services.
|  | Year ended December 31, 2016
Income Statement: |  | Previously Reported |  | Adjustments |  | As Adjusted
OPERATING REVENUES: |  |  |  |  |  |  |  |  |
Flying agreements (1) |  | $ | 3,051,414 |  | $ | (40,676) |  | $ | 3,010,738
Airport customer service and other (2) |  |  | 69,792 |  |  | (16,828) |  |  | 52,964
Total operating revenues |  | $ | 3,121,206 |  | $ | (57,504) |  | $ | 3,063,702
OPERATING EXPENSES: |  |  |  |  |  |  |  |  |
Salaries, wages and benefits |  | $ | 1,211,380 |  | $ | (5,921) |  | $ | 1,205,459
Aircraft fuel |  |  | 122,284 |  |  | (51,583) |  |  | 70,701
Airport-related expenses (3) |  |  | 72,659 |  |  | 49,482 |  |  | 122,141
Other operating expenses |  |  | 305,041 |  |  | (49,482) |  |  | 255,559
Total operating expenses |  |  | 3,293,890 |  |  | (57,504) |  |  | 3,236,386
OPERATING INCOME |  | $ | (172,684) |  | $ | — |  | $ | (172,684)
| 1. |  | In previously reported periods, this line item was presented as passenger revenue.
| 2. |  | In previously reported periods, this line item was presented as ground handling and other.
| 3. |  | In previously reported periods, this line item was presented as ground handling services.
Balance Sheet: |  | Previously Reported December 31, 2017 |  | Adjustments |  | Current Presentation December 31, 2017
ASSETS: |  |  |  |  |  |  |
Other long-term assets |  | $ | 49,220 |  | $ | 16,121 |  | $ | 65,341
LIABILITIES: |  |  |  |  |  |  |
Other long-term liabilities |  | $ | 42,541 |  | $ | 16,121 |  | $ | 58,662
The $16.1 million adjustment to other long-term assets and other long-term liabilities reflects the amount of capitalized up-front contract costs and the amount of deferred revenue for up-front reimbursements as of December 31, 2017. The $16.1 million capitalized contract costs and deferred revenue is expected to be amortized over the applicable remaining contract term. For the year ended December 31, 2018 and 2017, the Company recognized $2.0 million and $1.5 million, respectively, of revenue and operating expense associated with the amortization of the up-front contract reimbursements. As of December 31, 2018, the Company had $64.2 million in accounts receivable of which $52.7 million related to flying agreements. As of December 31, 2017, the Company had $42.7 million in accounts receivable of which $33.9 million related to flying agreements.

X
- Definition Disclosure of accounting policy for deferred aircraft credits. + References No definition available. + Details
Name: | skyw_DeferredAircraftCreditsPolicyTextBlock
Namespace Prefix: | skyw_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration

X
- Definition Disclosure of accounting policy for cash and cash equivalents, including the policy for determining which items are treated as cash equivalents. Other information that may be disclosed includes (1) the nature of any restrictions on the entity's use of its cash and cash equivalents, (2) whether the entity's cash and cash equivalents are insured or expose the entity to credit risk, (3) the classification of any negative balance accounts (overdrafts), and (4) the carrying basis of cash equivalents (for example, at cost) and whether the carrying amount of cash equivalents approximates fair value. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=98513485&loc=d3e4273-108586 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(1)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 305 -SubTopic 10 -Section 05 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6375392&loc=d3e26790-107797 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=84158767&loc=d3e18780-107790 + Details
Name: | us-gaap_CashAndCashEquivalentsPolicyTextBlock
Namespace Prefix: | us-gaap_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration

X
- Definition Disclosure of accounting policy regarding (1) the principles it follows in consolidating or combining the separate financial statements, including the principles followed in determining the inclusion or exclusion of subsidiaries or other entities in the consolidated or combined financial statements and (2) its treatment of interests (for example, common stock, a partnership interest or other means of exerting influence) in other entities, for example consolidation or use of the equity or cost methods of accounting. The accounting policy may also address the accounting treatment for intercompany accounts and transactions, noncontrolling interest, and the income statement treatment in consolidation for issuances of stock by a subsidiary. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.3A-02) -URI http://asc.fasb.org/extlink&oid=27015204&loc=d3e355033-122828 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section S99 -Paragraph 3 -Subparagraph (SX 210.3A-03) -URI http://asc.fasb.org/extlink&oid=27015204&loc=d3e355100-122828 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=84158767&loc=d3e18780-107790 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=109239629&loc=d3e5614-111684 + Details
Name: | us-gaap_ConsolidationPolicyTextBlock
Namespace Prefix: | us-gaap_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration

X
- Definition Disclosure of accounting policy for computing basic and diluted earnings or loss per share for each class of common stock and participating security. Addresses all significant policy factors, including any antidilutive items that have been excluded from the computation and takes into account stock dividends, splits and reverse splits that occur after the balance sheet date of the latest reporting period but before the issuance of the financial statements. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=84158767&loc=d3e18780-107790 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3630-109257 + Details
Name: | us-gaap_EarningsPerSharePolicyTextBlock
Namespace Prefix: | us-gaap_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration

X
- Definition Disclosure of accounting policy for determining the fair value of financial instruments. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 60 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=7493716&loc=d3e21868-110260 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=109250915&loc=d3e13279-108611 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=84158767&loc=d3e18780-107790 + Details
Name: | us-gaap_FairValueOfFinancialInstrumentsPolicy
Namespace Prefix: | us-gaap_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration

X
- Definition Disclosure of accounting policy for recognizing and measuring the impairment of long-lived assets. An entity also may disclose its accounting policy for long-lived assets to be sold. This policy excludes goodwill and intangible assets. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 05 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=109226317&loc=d3e202-110218 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=84158767&loc=d3e18780-107790 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SAB Topic 5.CC) -URI http://asc.fasb.org/extlink&oid=27011434&loc=d3e125687-122742 + Details
Name: | us-gaap_ImpairmentOrDisposalOfLongLivedAssetsPolicyTextBlock
Namespace Prefix: | us-gaap_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration

X
- Definition Disclosure of accounting policy for income taxes, which may include its accounting policies for recognizing and measuring deferred tax assets and liabilities and related valuation allowances, recognizing investment tax credits, operating loss carryforwards, tax credit carryforwards, and other carryforwards, methodologies for determining its effective income tax rate and the characterization of interest and penalties in the financial statements. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 20 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32847-109319 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 954 -SubTopic 740 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6491622&loc=d3e9504-115650 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=84158767&loc=d3e18780-107790 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 17 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32809-109319 Reference 5: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 19 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32840-109319 Reference 6: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 45 -Paragraph 25 -URI http://asc.fasb.org/extlink&oid=84176650&loc=d3e32247-109318 Reference 7: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 45 -Paragraph 28 -URI http://asc.fasb.org/extlink&oid=84176650&loc=d3e32280-109318 Reference 8: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 30 -Section 05 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=65884525&loc=d3e40913-109327 + Details
Name: | us-gaap_IncomeTaxPolicyTextBlock
Namespace Prefix: | us-gaap_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration

X
- Definition Disclosure of accounting policy for interest capitalization. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6450988&loc=d3e26243-108391 + Details
Name: | us-gaap_InterestCapitalizationPolicyPolicyTextBlock
Namespace Prefix: | us-gaap_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration

X
- Definition Disclosure of inventory accounting policy for inventory classes, including, but not limited to, basis for determining inventory amounts, methods by which amounts are added and removed from inventory classes, loss recognition on impairment of inventories, and situations in which inventories are stated above cost. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 330 -SubTopic 10 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=66092785&loc=d3e4556-108314 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=84158767&loc=d3e18780-107790 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6361739&loc=d3e7789-107766 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 270 -SubTopic 10 -Section 45 -Paragraph 6 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=109236672&loc=d3e543-108305 Reference 5: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 330 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=66092785&loc=d3e4492-108314 Reference 6: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.6(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
Name: | us-gaap_InventoryPolicyTextBlock
Namespace Prefix: | us-gaap_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration

X
- 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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB Topic 5.M) -URI http://asc.fasb.org/extlink&oid=65877573&loc=d3e87990-122713 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 6 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27290-111563 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=84158767&loc=d3e18780-107790 Reference 5: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 323 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=114001798&loc=d3e33918-111571 + Details
Name: | us-gaap_InvestmentPolicyTextBlock
Namespace Prefix: | us-gaap_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration

X
- Definition Disclosure of the accounting policy for maintenance costs. Does not include planned major maintenance activities. + References No definition available. + Details
Name: | us-gaap_MaintenanceCostPolicyPolicyTextBlock
Namespace Prefix: | us-gaap_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration

X
- Definition Disclosure of accounting policy pertaining to new accounting pronouncements that may impact the entity's financial reporting. Includes, but is not limited to, quantification of the expected or actual impact. + References No definition available. + Details
Name: | us-gaap_NewAccountingPronouncementsPolicyPolicyTextBlock
Namespace Prefix: | us-gaap_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration

X
- References No definition available. + Details
Name: | us-gaap_OrganizationConsolidationAndPresentationOfFinancialStatementsAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Disclosure of accounting policy for long-lived, physical assets used in the normal conduct of business and not intended for resale. Includes, but is not limited to, basis of assets, depreciation and depletion methods used, including composite deprecation, estimated useful lives, capitalization policy, accounting treatment for costs incurred for repairs and maintenance, capitalized interest and the method it is calculated, disposals and impairments. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -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 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6391035&loc=d3e2868-110229 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=84158767&loc=d3e18780-107790 + Details
Name: | us-gaap_PropertyPlantAndEquipmentPolicyTextBlock
Namespace Prefix: | us-gaap_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration

X
- Definition Disclosure of accounting policy for revenue from contract with customer. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section 50 -Paragraph 4 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=84158767&loc=d3e18823-107790 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -URI http://asc.fasb.org/topic&trid=49130388 + Details
Name: | us-gaap_RevenueFromContractWithCustomerPolicyTextBlock
Namespace Prefix: | us-gaap_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration

X
- Definition Disclosure of accounting policy for segment reporting. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=84158767&loc=d3e18780-107790 + Details
Name: | us-gaap_SegmentReportingPolicyPolicyTextBlock
Namespace Prefix: | us-gaap_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration

X
- Definition Disclosure of accounting policy for its capital stock transactions, including dividends and accumulated other comprehensive income. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=109259400&loc=d3e21459-112644 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=84158767&loc=d3e18780-107790 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=84158767&loc=d3e18726-107790 + Details
Name: | us-gaap_StockholdersEquityPolicyTextBlock
Namespace Prefix: | us-gaap_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration

X
- Definition Disclosure of accounting policy for the use of estimates in the preparation of financial statements in conformity with generally accepted accounting principles. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 275 -SubTopic 10 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=99393423&loc=d3e6191-108592 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 275 -SubTopic 10 -Section 50 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=99393423&loc=d3e6161-108592 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 275 -SubTopic 10 -Section 50 -Paragraph 9 -URI http://asc.fasb.org/extlink&oid=99393423&loc=d3e6143-108592 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 275 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=99393423&loc=d3e5967-108592 Reference 5: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 275 -SubTopic 10 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=99393423&loc=d3e6061-108592 Reference 6: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 275 -SubTopic 10 -Section 50 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=99393423&loc=d3e6132-108592 Reference 7: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 275 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=99393423&loc=d3e5967-108592 + Details
Name: | us-gaap_UseOfEstimates
Namespace Prefix: | us-gaap_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration