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Fair Value Measurements (Details) (USD $) In Thousands, unless otherwise specified | Mar. 31, 2013 Significant Other Observable Inputs (level 2) Recurring basis | Dec. 31, 2012 Significant Other Observable Inputs (level 2) Recurring basis | Mar. 31, 2013 Significant Unobservable Inputs (Level 3) Nonrecurring basis | Mar. 31, 2012 Significant Unobservable Inputs (Level 3) Nonrecurring basis
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Summarizes the valuation of interest rate swaps and impaired assets |  |  |  |
Interest rate swaps (liability) | $ (8,727) | $ (9,916) |  |
Impaired long-lived assets |  |  | 1,216 | 1,800
Impaired long-lived assets-Discontinued operations |  |  | $ 273 |

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