Equity (Details) - Changes in AOCI by Component (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	$ (132,400)
Other comprehensive loss, net of tax	(5,028)	$ (21,158)
Ending balance	(112,670)
Interest Rate Swaps
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	(3,079)	(1,740)
Change in AOCL/I before reclassifications to income	(8,357)	(1,857)
Reclassifications from AOCI to income during the period	1,224	753
Other comprehensive loss, net of tax	(7,133)	(1,104)
Ending balance	(10,212)	(2,844)
Defined Benefit Pension Plans
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	(4,832)	(6,028)
Change in AOCL/I before reclassifications to income	0	0
Reclassifications from AOCI to income during the period	37	53
Other comprehensive loss, net of tax	37	53
Ending balance	(4,795)	(5,975)
Foreign Currency Translation Adjustments
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	(36,491)	(13,402)
Change in AOCL/I before reclassifications to income	2,068	(20,107)
Reclassifications from AOCI to income during the period	0	0
Other comprehensive loss, net of tax	2,068	(20,107)
Ending balance	(34,423)	(33,509)
AOCI Attributable to Parent
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	(44,402)	(21,170)
Change in AOCL/I before reclassifications to income	(6,289)	(21,964)
Reclassifications from AOCI to income during the period	1,261	806
Other comprehensive loss, net of tax	(5,028)	(21,158)
Ending balance	$ (49,430)	$ (42,328)