Stockholders' Equity - Changes in AOCL/I by Component (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Accumulated Other Comprehensive (Loss) Income, Net of Tax [Roll Forward]
Beginning Balance	$ 938,593	$ 850,757	$ 983,465
Other comprehensive income (loss) activity during the year:
Change in AOCI/L before reclassifications to income	(47,544)	(35,791)
Reclassifications from AOCI/L to income	26,254	(2,280)
Other comprehensive income (loss) for the year	(21,290)	(38,071)	(41,966)
Ending Balance	1,090,428	938,593	850,757
Derivative reclassifications	(47,180)	873	(8,445)
Interest rate swap | Other Expense
Other comprehensive income (loss) activity during the year:
Derivative reclassifications	10,300
Interest rate swap | Interest Income (Expense)
Other comprehensive income (loss) activity during the year:
Derivative reclassifications	24,900	(3,400)
AOCI Attributable to Parent
Accumulated Other Comprehensive (Loss) Income, Net of Tax [Roll Forward]
Beginning Balance	(77,938)	(39,867)	1,508
Other comprehensive income (loss) activity during the year:
Other comprehensive income (loss) for the year	(21,290)	(38,071)	(41,966)
Ending Balance	(99,228)	(77,938)	(39,867)
Interest Rate Swaps
Accumulated Other Comprehensive (Loss) Income, Net of Tax [Roll Forward]
Beginning Balance	(47,164)	(7,770)
Other comprehensive income (loss) activity during the year:
Change in AOCI/L before reclassifications to income	(56,862)	(36,949)
Reclassifications from AOCI/L to income	25,922	(2,445)
Other comprehensive income (loss) for the year	(30,940)	(39,394)
Ending Balance	(78,104)	(47,164)	(7,770)
Defined Benefit Pension Plans
Accumulated Other Comprehensive (Loss) Income, Net of Tax [Roll Forward]
Beginning Balance	(8,584)	(5,738)
Other comprehensive income (loss) activity during the year:
Change in AOCI/L before reclassifications to income	(1,057)	(3,011)
Reclassifications from AOCI/L to income	332	165
Other comprehensive income (loss) for the year	(725)	(2,846)
Ending Balance	(9,309)	(8,584)	(5,738)
Foreign Currency Translation Adjustments
Accumulated Other Comprehensive (Loss) Income, Net of Tax [Roll Forward]
Beginning Balance	(22,190)	(26,359)
Other comprehensive income (loss) activity during the year:
Change in AOCI/L before reclassifications to income	10,375	4,169
Reclassifications from AOCI/L to income	0	0
Other comprehensive income (loss) for the year	10,375	4,169
Ending Balance	$ (11,815)	$ (22,190)	$ (26,359)