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Financial Instruments and Fair Values - Gain and Loss of Cash Flow Hedges (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Derivative Instruments, Gain (Loss) [Line Items]
Amount of gain (loss) recognized in other comprehensive income (loss)	$ (2,721)	$ (11,658)
Amount of gain (loss) recognized in other comprehensive income (loss)			$ (3,054)
Amount of gain (loss) reclassified from accumulated other comprehensive income (loss) into interest expense	(1,845)	(1,142)
Amount of gain (loss) reclassified from accumulated other comprehensive income (loss) into interest expense			0
Interest expense	(79,623)	(68,473)	(70,595)
Interest rate swaps
Derivative Instruments, Gain (Loss) [Line Items]
Amount of gain (loss) recognized in other comprehensive income (loss)	(2,721)
Amount of gain (loss) reclassified from accumulated other comprehensive income (loss) into interest expense	(1,845)
Designated as Hedging Instrument | Cash Flow Hedging
Derivative Instruments, Gain (Loss) [Line Items]
Amount of gain (loss) recognized in other comprehensive income (loss)	(900)	(10,500)
Designated as Hedging Instrument | Cash Flow Hedging | Interest rate swaps
Derivative Instruments, Gain (Loss) [Line Items]
Amount of gain (loss) recognized in other comprehensive income (loss)		(11,658)
Amount of gain (loss) recognized in other comprehensive income (loss)			(3,054)
Amount of gain (loss) reclassified from accumulated other comprehensive income (loss) into interest expense		(1,142)
Amount of gain (loss) reclassified from accumulated other comprehensive income (loss) into interest expense			0
Accumulated other comprehensive income (loss) | Interest rate swaps
Derivative Instruments, Gain (Loss) [Line Items]
Interest expense	$ (1,845)	$ (1,142)	$ 0

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

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