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Fair Value Measurements (Details) - USD ($) $ in Thousands | Jun. 30, 2015 | Dec. 31, 2014 | Jun. 30, 2014
--- | --- | --- | ---
Significant Other Observable Inputs (Level 2) | Recurring basis |  |  |
Fair value measurement of assets and liabilities |  |  |
Interest rate swaps asset | $ 710 | $ 712 |
Interest rate swaps liability | (7,427) | $ (5,108) |
Significant Unobservable Inputs (Level 3) | Nonrecurring basis |  |  |
Fair value measurement of assets and liabilities |  |  |
Impaired long-lived assets | 3,072 |  | $ 1,671
Long-term receivable from the sale of Canadian Operations | $ 5,100 |  |

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