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Interest Rate Contracts - Impact of Interest Rate Swap on Consolidated Statements of Operation (Details) - Interest Rate Swap - Cash Flow Hedging - USD ($) $ in Thousands | 6 Months Ended
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Jun. 30, 2019 | Jun. 30, 2018
Derivative Instruments, Gain (Loss) [Line Items] |  |
Amount of (loss) gain recognized in AOCI on derivatives | $ (19,107) | $ 4,753
Amount of (gain) reclassified from AOCI into earnings under “Interest expense” | (1,655) | (774)
Total interest expense presented in the consolidated statement of operations in which the effects of cash flow hedges are recorded | $ 34,082 | $ 27,090

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