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Fair Value Measurements - Assets and Liabilities Measured at Fair Value (Details) - USD ($) $ in Thousands | Jun. 30, 2017 | Dec. 31, 2016
--- | --- | ---
Level 1 | Recurring basis |  |
Fair value measurement of assets and liabilities |  |
Interest rate swaps asset | $ 0 | $ 0
Interest rate swaps liability | 0 | 0
Level 1 | Nonrecurring basis |  |
Fair value measurement of assets and liabilities |  |
Impaired long-lived assets | 0 | 0
Level 2 | Recurring basis |  |
Fair value measurement of assets and liabilities |  |
Interest rate swaps asset | 254 | 413
Interest rate swaps liability | (1,321) | (3,603)
Level 2 | Nonrecurring basis |  |
Fair value measurement of assets and liabilities |  |
Impaired long-lived assets | 0 | 0
Level 3 | Recurring basis |  |
Fair value measurement of assets and liabilities |  |
Interest rate swaps asset | 0 | 0
Interest rate swaps liability | 0 | 0
Level 3 | Nonrecurring basis |  |
Fair value measurement of assets and liabilities |  |
Impaired long-lived assets | $ 816 | $ 6,460

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