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Fair Value Measurements (Details) - USD ($) $ in Thousands | Dec. 31, 2015 | Dec. 31, 2014
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(Level 2) | Recurring basis |  |
Fair value measurement of assets and liabilities |  |
Interest rate swaps asset | $ 45 | $ 712
Interest rate swaps liability | (6,029) | (5,108)
(Level 3) | Nonrecurring basis |  |
Fair value measurement of assets and liabilities |  |
Impaired long-lived assets | $ 12,565 | $ 3,359

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