Equity - Changes in AOCI/L by Component (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	$ 938,593	$ 850,757
Change in AOCI/L before reclassifications to income	(93,435)	(20,089)
Reclassifications from AOCL/I to income	2,401	(1,610)
Other comprehensive loss, net of tax	(91,034)	(21,699)
Ending balance	890,275	856,897
Interest Rate Swaps
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	(47,164)	(7,770)
Change in AOCI/L before reclassifications to income	(47,054)	(12,853)
Reclassifications from AOCL/I to income	2,322	(1,652)
Other comprehensive loss, net of tax	(44,732)	(14,505)
Ending balance	(91,896)	(22,275)
Defined Benefit Pension Plans
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	(8,584)	(5,738)
Change in AOCI/L before reclassifications to income	0	0
Reclassifications from AOCL/I to income	79	42
Other comprehensive loss, net of tax	79	42
Ending balance	(8,505)	(5,696)
Foreign Currency Translation Adjustments
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	(22,190)	(26,359)
Change in AOCI/L before reclassifications to income	(46,381)	(7,236)
Reclassifications from AOCL/I to income	0	0
Other comprehensive loss, net of tax	(46,381)	(7,236)
Ending balance	(68,571)	(33,595)
Accumulated Other Comprehensive Loss, Net
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	(77,938)	(39,867)
Other comprehensive loss, net of tax	(91,034)	(21,699)
Ending balance	$ (168,972)	$ (61,566)