Derivative Instruments (Narrative) (Details) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2020	Dec. 31, 2019
Derivative [Line Items]
Gain (loss) to be reclassified within twelve months	$ 4,600
Interest Rate Swap
Derivative [Line Items]
Notional Amount	$ 476,555	$ 479,825