Accumulated Other Comprehensive Income (Loss) - Components of Accumulated Other Comprehensive Income (Loss) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Accumulated Other Comprehensive Income Loss [Line Items]
Beginning Balance	$ 1,832,750	$ 2,034,949	$ 1,792,179	$ 2,067,964
Reclassification to interest expense	296	337	604	681
Tax effect			(133)	(161)
Ending Balance	1,930,367	2,127,109	1,930,367	2,127,109
Interest Rate Derivatives [Member]
Accumulated Other Comprehensive Income Loss [Line Items]
Beginning Balance			(2,827)	(3,841)
Reclassification to interest expense			604	681
Tax effect			(133)	(161)
Ending Balance	(2,356)	(3,321)	(2,356)	(3,321)
Foreign Currency Translation [Member]
Accumulated Other Comprehensive Income Loss [Line Items]
Beginning Balance			9	9
Reclassification to interest expense			0	0
Tax effect			0	0
Ending Balance	9	9	9	9
Accumulated Other Comprehensive Income (Loss) [Member]
Accumulated Other Comprehensive Income Loss [Line Items]
Beginning Balance	(2,573)	(3,569)	(2,818)	(3,832)
Ending Balance	$ (2,347)	$ (3,312)	$ (2,347)	$ (3,312)