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Fair Value Measurements - Assets and Liabilities Measured at Fair Value (Details) - Recurring basis - Level 2 - USD ($) $ in Thousands | Jun. 30, 2018 | Dec. 31, 2017
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Fair value measurement of assets and liabilities |  |
Interest rate swaps asset | $ 11,866 | $ 4,676
Interest rate swaps liability | $ 0 | $ (134)

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