Equity - Changes in AOCI/L by Component (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	$ 850,757	$ 983,465
Other comprehensive (loss) income, net of tax	(21,699)	30,717
Ending balance	856,897	987,571
Interest Rate Swaps
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	(7,770)	2,483
Change in AOCI/L before reclassifications to income	(12,853)	9,365
Reclassifications from AOCL/I to income	(1,652)	749
Other comprehensive (loss) income, net of tax	(14,505)	10,114
Ending balance	(22,275)	12,597
Defined Benefit Pension Plans
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	(5,738)	(5,861)
Change in AOCI/L before reclassifications to income	0	0
Reclassifications from AOCL/I to income	42	56
Other comprehensive (loss) income, net of tax	42	56
Ending balance	(5,696)	(5,805)
Foreign Currency Translation Adjustments
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	(26,359)	4,886
Change in AOCI/L before reclassifications to income	(7,236)	20,547
Reclassifications from AOCL/I to income	0	0
Other comprehensive (loss) income, net of tax	(7,236)	20,547
Ending balance	(33,595)	25,433
Accumulated Other Comprehensive Income, Net
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	(39,867)	1,508
Change in AOCI/L before reclassifications to income	(20,089)	29,912
Reclassifications from AOCL/I to income	(1,610)	805
Other comprehensive (loss) income, net of tax	(21,699)	30,717
Ending balance	$ (61,566)	$ 32,225