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Fair Value Measurements (Details) (USD $) In Thousands, unless otherwise specified | 3 Months Ended |  |  |  |
--- | --- | --- | --- | --- | ---
Jun. 30, 2012 | Jun. 30, 2013 Significant Other Observable Inputs (Level 2) Recurring basis | Dec. 31, 2012 Significant Other Observable Inputs (Level 2) Recurring basis | Jun. 30, 2013 Significant Unobservable Inputs (Level 3) Nonrecurring basis | Jun. 30, 2012 Significant Unobservable Inputs (Level 3) Nonrecurring basis
Summarizes the valuation of interest rate swaps and impaired assets |  |  |  |  |
Interest rate swaps asset |  | $ 132 |  |  |
Interest rate swaps liability |  | (3,276) | (9,916) |  |
Impaired long-lived assets |  |  |  | 3,825 | 31,605
Impaired long-lived assets-Discontinued operations |  |  |  |  | $ 22,035
Disposition of impaired fleet assets minimum time required | 12 months |  |  |  |
Weighted average disposal period of impaired fleet assets | 4 years |  |  |  |
Weighted average discount rate of expected proceeds on impaired fleet assets (as a percent) | 10.40% |  |  |  |

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- Definition Long-lived assets that are held for sale apart from normal operations and anticipated to be sold in less than one year related to discontinued operations fair value disclosure. + References No definition available. + Details
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- Definition Fair value of derivative liability, presented on a gross basis even when the derivative instrument is subject to master netting arrangements and qualifies for net presentation in the statement of financial position. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 133 -Paragraph 205G -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009.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 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 133 -Paragraph 44C -Subparagraph a -Clause 1 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009.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 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4B -Subparagraph (a),(c) -URI http://asc.fasb.org/extlink&oid=7476318&loc=SL5624163-113959 + Details
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- Definition Interest rate used to find the present value of an amount to be paid or received in the future as an input to measure fair value. For example, but not limited to, weighted average cost of capital (WACC), cost of capital, cost of equity and cost of debt. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (bbb) -URI http://asc.fasb.org/extlink&oid=7578670&loc=d3e19207-110258 + Details
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