Derivative Financial Instruments - Effect of Cash Flow Hedging on AOCI (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Derivative [Line Items]
Loss recognized in AOCI on derivative	$ 1,455	$ 4,577	$ 15,386	$ 5,301
(Gain) loss reclassified from AOCI into income	(938)	1	(1,267)	(15)
Interest rate swaps
Derivative [Line Items]
Loss recognized in AOCI on derivative	1,455	4,577	11,119	5,301
Settled treasury hedges
Derivative [Line Items]
Loss recognized in AOCI on derivative	0	0	4,267	0
Settled interest rate swaps
Derivative [Line Items]
Loss recognized in AOCI on derivative	0	0	0	0
Total interest expense
Derivative [Line Items]
(Gain) loss reclassified from AOCI into income	938	(1)	1,267	15
Total interest expense | Interest rate swaps
Derivative [Line Items]
(Gain) loss reclassified from AOCI into income	789	(43)	1,061	(69)
Total interest expense | Settled treasury hedges
Derivative [Line Items]
(Gain) loss reclassified from AOCI into income	107	0	122	0
Total interest expense | Settled interest rate swaps
Derivative [Line Items]
(Gain) loss reclassified from AOCI into income	$ 42	$ 42	$ 84	$ 84