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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
	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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Total amount of gain (loss) derived from fair value hedges recognized in earnings in the period.

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Amount, after tax and before reclassification, of gain (loss) from derivative instrument designated and qualifying as cash flow hedge included in assessment of hedge effectiveness.

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Amount, after tax, of reclassification of gain (loss) from accumulated other comprehensive income (AOCI) for derivative instrument designated and qualifying as cash flow hedge included in assessment of hedge effectiveness.

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