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Fair Value Measurements (Details) (USD $) In Thousands, unless otherwise specified | 6 Months Ended |  |  |  |
--- | --- | --- | --- | --- | ---
Jun. 30, 2014 Impaired long-lived assets | Jun. 30, 2014 Significant Other Observable Inputs (Level 2) Recurring basis | Dec. 31, 2013 Significant Other Observable Inputs (Level 2) Recurring basis | Jun. 30, 2014 Significant Unobservable Inputs (Level 3) Nonrecurring basis | Jun. 30, 2013 Significant Unobservable Inputs (Level 3) Nonrecurring basis
Summarizes the valuation of interest rate swaps and impaired assets |  |  |  |  |
Interest rate swaps asset |  |  | $ 322 |  |
Interest rate swaps liability |  | (4,294) | (3,374) |  |
Impaired long-lived assets |  |  |  | 1,671 | 3,825
Inventory write-down - Restructuring |  |  |  | $ 2,331 |
Weighted average disposal period of impaired assets | 4 years |  |  |  |
Discount rate (as a percent) | 8.60% |  |  |  |

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