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Financial Instruments and Fair Values - Effect of Derivative Financial Instruments Designated as Cash Flow Hedges (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Derivative Instruments, Gain (Loss) [Line Items]
Interest expense	$ (20,525)	$ (17,477)	$ (38,116)	$ (35,219)
Designated as Hedging Instrument | Interest Rate Swap | Cash Flow Hedging
Derivative Instruments, Gain (Loss) [Line Items]
Amount of gain (loss) recognized in other comprehensive income (loss)	1,763	(14,410)	5,943	(13,016)
Amount of gain (loss) reclassified from accumulated other comprehensive income (loss) into interest expense	(536)	(43)	(1,135)	(43)
Accumulated net gain (loss) from cash flow hedges | Reclassification out of Accumulated Other Comprehensive Income | Interest Rate Swap
Derivative Instruments, Gain (Loss) [Line Items]
Interest expense	$ (536)	$ (43)	$ (1,135)	$ (43)

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The effective portion of net gain (loss) reclassified from accumulated other comprehensive income into income on derivative instruments designated and qualifying as hedging instruments.

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Amount of the cost of borrowed funds accounted for as interest expense.

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Amount before tax of increase (decrease) in accumulated gain (loss) from derivative instruments designated and qualifying as the effective portion of cash flow hedges and an entity's share of an equity investee's increase (decrease) in deferred hedging gain (loss).

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