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Assets held for sale (Details) (USD $)
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3 Months Ended | 12 Months Ended | |||||||||
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Dec. 31, 2012
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Sep. 30, 2012
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Jun. 30, 2012
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Mar. 31, 2012
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Dec. 31, 2011
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Sep. 30, 2011
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Jun. 30, 2011
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Mar. 31, 2011
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Dec. 31, 2012
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Dec. 31, 2011
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Dec. 31, 2010
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| Held for Sale Business | |||||||||||
| Period of project disposal | 12 months | ||||||||||
| Impairment of long-lived assets charge | $ 50,000,000 | ||||||||||
| Revenue | 216,705,000 | 191,000,000 | 194,205,000 | ||||||||
| Income from operations of discontinued businesses | 18,260,000 | 38,957,000 | 27,033,000 | ||||||||
| Income tax expense | 1,801,000 | 2,780,000 | 2,906,000 | ||||||||
| Income from operations of discontinued businesses, net of tax | (34,515,000) | 20,106,000 | 19,319,000 | 11,549,000 | (811,000) | 10,442,000 | 13,682,000 | 12,864,000 | 16,459,000 | 36,177,000 | 24,127,000 |
| Basic earnings per share related to income from discontinued operations | $ (0.29) | $ 0.17 | $ 0.17 | $ 0.10 | $ (0.01) | $ 0.16 | $ 0.20 | $ 0.19 | $ 0.14 | $ 0.46 | $ 0.39 |
| Diluted earnings per share related to income from discontinued operations | $ (0.29) | $ 0.17 | $ 0.17 | $ 0.10 | $ (0.01) | $ 0.16 | $ 0.19 | $ 0.19 | $ 0.14 | $ 0.46 | $ 0.39 |
| Current assets: | |||||||||||
| Cash and cash equivalents | 6,473,000 | 6,473,000 | |||||||||
| Restricted cash | 12,658,000 | 12,658,000 | |||||||||
| Accounts receivable | 21,894,000 | 21,894,000 | |||||||||
| Other current assets | 6,260,000 | 6,260,000 | |||||||||
| Total current assets | 351,379,000 | 351,379,000 | |||||||||
| Non-current assets: | |||||||||||
| Property, plant, and equipment | 111,931,000 | 111,931,000 | |||||||||
| Transmission system rights | 172,430,000 | 172,430,000 | |||||||||
| Goodwill | 8,918,000 | 8,918,000 | |||||||||
| Other Intangible assets | 9,994,000 | 9,994,000 | |||||||||
| Other assets | 821,000 | 821,000 | |||||||||
| Assets held for sale | 351,379,000 | 351,379,000 | |||||||||
| Current liabilities: | |||||||||||
| Accounts payable and other accrued liabilities | 16,459,000 | 16,459,000 | |||||||||
| Current portion of long-term debt | 14,302,000 | 14,302,000 | |||||||||
| Current portion of derivative instrument asset | 20,586,000 | 20,586,000 | |||||||||
| Total current liabilities | 189,038,000 | 189,038,000 | |||||||||
| Long-term liabilities | |||||||||||
| Long-term debt | 137,666,000 | 137,666,000 | |||||||||
| Deferred tax liability | 25,000 | 25,000 | |||||||||
| Liabilities held for sale | $ 189,038,000 | $ 189,038,000 | |||||||||
| X | ||||||||||
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- Definition
For the disposal group, including a component of the entity (discontinued operation), carrying amount of accounts payable and other accrued liabilities. No definition available.
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| X | ||||||||||
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- Definition
For the disposal group, including a component of the entity (discontinued operation), fair values as of the balance sheet date of all liabilities resulting from contracts that meet the criteria of being accounted for as derivative instruments, and which are expected to be extinguished or otherwise disposed of within a year or the normal operating cycle, if longer, net of the effects of master netting arrangements. No definition available.
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- Definition
For the disposal group, including a component of the entity (discontinued operation), carrying amount of long-term debt, net of unamortized discount or premium, scheduled to be repaid within one year or the normal operating cycle, if longer. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations. No definition available.
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- Definition
For the disposal group, including a component of the entity (discontinued operation), carrying amount of long-term debt, net of unamortized discount or premium, excluding amounts to be repaid within one year or the normal operating cycle, if longer (current maturities). Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations. No definition available.
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- Definition
Sales of disposal groups, including those classified as components of the entity (discontinued operations), are generally expected to be completed within one year of their classification as held-for-sale. No definition available.
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- Definition
For the disposal group, including a component of the entity (discontinued operation), carrying amount of restricted cash and cash equivalents. No definition available.
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- Definition
For the disposal group, including a component of the entity (discontinued operation), carrying amount of transmission system rights. No definition available.
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- Definition
The aggregate value (measured at the lower of net carrying value or fair value less cost of disposal) for assets of a disposal group, including a component of the entity (discontinued operation), to be sold or that has been disposed of through sale, as of the financial statement date. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
The aggregate value (measured at the lower of net carrying value or fair value less cost of disposal) for current assets (assets with expected useful life shorter than one year or one operating cycle, whichever is longer) of a disposal group, including a component of the entity (discontinued operation), to be sold or that has subsequently been disposed of through sale, as of the financial statement date. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Details
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- Details
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- Definition
Overall income (loss) from a disposal group that is classified as a component of the entity, before income tax, reported as a separate component of income before extraordinary items. Includes the following (before income tax): income (loss) from operations during the phase-out period, gain (loss) on disposal, provision (or any reversals of earlier provisions) for loss on disposal, and adjustments of a prior period gain (loss) on disposal. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition
Tax effect allocated to a disposal group that is classified as a component of the entity reported as a separate component of income before extraordinary items. Includes the tax effects of the following: income (loss) from operations during the phase-out period, gain (loss) on disposal, provision (or any reversals of earlier provisions) for loss on disposal, and adjustments of a prior period gain (loss) on disposal. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition
For the disposal group, including a component of the entity (discontinued operation), the aggregate of amounts due from customers or clients for goods or services that have been delivered or sold in the normal course of business and an amount representing an agreement for an unconditional promise by the maker to pay the entity (holder) a definite sum of money at a future date, reduced to their estimated net realizable fair value by an allowance established by the entity of the amount it deems uncertain of collection and net of any write-downs taken for collection uncertainty on the part of the holder, respectively. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition
For the disposal group, including a component of the entity (discontinued operation), cash includes currency on hand as well as demand deposits with banks or financial institutions. Cash equivalents, excluding items classified as marketable securities, include short-term, highly liquid investments that are both readily convertible to known amounts of cash, and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. Generally, only investments with original maturities of three months or less qualify under that definition. Original maturity means original maturity to the entity holding the investment. For example, both a three-month US Treasury bill and a three-year Treasury note purchased three months from maturity qualify as cash equivalents. However, a Treasury note purchased three years ago does not become a cash equivalent when its remaining maturity is three months. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition
For a disposal group, including a component of the entity (discontinued operation), represents deferred tax liabilities, which result from applying the applicable tax rate to net taxable temporary differences pertaining to each jurisdiction to which the entity is obligated to pay income tax. A taxable temporary difference is a difference between the tax basis and the carrying amount of a asset or liability in the financial statements prepared in accordance with generally accepted accounting principles. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
For the disposal group, including a component of the entity (discontinued operation), carrying amount of goodwill (adjusted for any amortization recognized prior to adoption of FAS 142 and impairment charges). Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition
For the disposal group, including a component of the entity (discontinued operation), carrying value (net of any accumulated amortization and write-downs) of nonphysical assets (such as copyrights, customer lists, patents, trade names, core deposits, trade secrets, and contractual rights), not elsewhere itemized. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition
For the disposal group, including a component of the entity (discontinued operation), carrying amount of assets not otherwise specified in the taxonomy that are expected to be realized or consumed within one year or the normal operating cycle, if longer. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition
For the disposal group, including a component of the entity (discontinued operation), carrying amount as of the balance sheet date of assets not otherwise specified, and which are expected to be realized or consumed after one year or beyond the normal operating cycle, if longer. For an unclassified balance sheet, represents both current and noncurrent other assets. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
For the disposal group, including a component of the entity (discontinued operation), carrying value (net of accumulated depreciation and any write-downs) of tangible assets that are held by an entity for use in the production or supply of goods and services, for rental to others, or for administrative purposes and that are expected to provide economic benefit for more than one year. Examples include land, buildings, machinery and equipment, and other types of furniture and equipment including, but not limited to, office equipment, furniture and fixtures, and computer equipment and software. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition
Amount of sales or other form of revenues attributable to the disposal group, including a component of the entity (discontinued operation), during the reporting period. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition
The aggregate amount of write-downs for impairments recognized during the period for long-lived assets held for abandonment, exchange or sale. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
Amount of income (loss) from a disposal group, net of income tax before extraordinary items allocable to noncontrolling interests. Includes, net of tax, income (loss) from operations during the phase-out period, gain (loss) on disposal, provision (or any reversals of earlier provisions) for loss on disposal, and adjustments of a prior period gain (loss) on disposal. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
The amount of net income (loss) derived from discontinued operations during the period, net of related tax effect, per each share of common stock or unit outstanding during the reporting period. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
The amount of net income or loss derived from discontinued operations during the period available to each share of common stock or common unit outstanding during the reporting period and to each share or unit that would have been outstanding assuming the issuance of common shares or units for all dilutive potential common shares or units outstanding during the reporting period. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Details
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| X | ||||||||||
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- Definition
The obligations arising from the sale, disposal, or planned sale in the near future (generally within one year) of a disposal group, including a component of the entity (discontinued operation). Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
Carrying value as of the balance sheet date of current obligations (due less than one year or one operating cycle, if longer) arising from the sale, disposal or planned sale in the near future (generally within one year) of a disposal group, including a component of the entity (discontinued operation). Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Details
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- Details
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