Derivative Instruments (Statement of Operations Gain Loss) (Details) - Not Designated as Hedging Instrument - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Derivative, Gain (Loss) on Derivative, Net
Gain (loss) on derivatives	$ (2,292)	$ (272)	$ (372)
Interest Rate Swap
Derivative, Gain (Loss) on Derivative, Net
Gain (loss) on derivatives	(149)	0	0
Interest rate cap
Derivative, Gain (Loss) on Derivative, Net
Gain (loss) on derivatives	(454)	(236)	(134)
Foreign Exchange Forward
Derivative, Gain (Loss) on Derivative, Net
Gain (loss) on derivatives	$ (1,689)	$ (36)	$ (238)