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Fair Value Measurements - Assets and Liabilities Measured at Fair Value (Details) - Recurring basis - Level 2 - USD ($) $ in Thousands | Sep. 30, 2017 | Dec. 31, 2016
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Fair value measurement of assets and liabilities |  |
Interest rate swaps asset | $ 1,884 | $ 413
Interest rate swaps liability |  | $ (3,603)

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