Derivative Financial Instruments - Effect of Cash Flow Hedging on AOCI (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Derivative [Line Items]
Gain (Loss) Recognized in OCI on Derivative	$ (2,341)	$ 374	$ (7,642)	$ 1,403
(Gain) Loss Reclassified from Accumulated OCI into Income	(60)	(95)	(74)	(369)
Interest Rate Swaps
Derivative [Line Items]
Gain (Loss) Recognized in OCI on Derivative	(2,341)	374	(7,642)	1,403
Settled Interest Rate Swaps
Derivative [Line Items]
Gain (Loss) Recognized in OCI on Derivative	0	0	0	0
Interest Expense
Derivative [Line Items]
(Gain) Loss Reclassified from Accumulated OCI into Income	60	95	74	369
Interest Expense | Interest Rate Swaps
Derivative [Line Items]
(Gain) Loss Reclassified from Accumulated OCI into Income	18	53	(52)	243
Interest Expense | Settled Interest Rate Swaps
Derivative [Line Items]
(Gain) Loss Reclassified from Accumulated OCI into Income	$ 42	$ 42	$ 126	$ 126