Equity (Details) - Changes in AOCI by Component (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance			$ (132,400)
Other comprehensive income (loss), net of tax	$ 1,427	$ 6,711	(3,601)	$ (14,447)
Ending balance	(52,828)		(52,828)
Interest Rate Swaps
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	(10,212)	(2,844)	(3,079)	(1,740)
Change in AOCL/I before reclassifications to income	(3,095)	(596)	(11,452)	(2,453)
Reclassifications from AOCI to income during the period	1,149	1,030	2,373	1,783
Other comprehensive income (loss), net of tax	(1,946)	434	(9,079)	(670)
Ending balance	(12,158)	(2,410)	(12,158)	(2,410)
Defined Benefit Pension Plans
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	(4,795)	(5,975)	(4,832)	(6,028)
Change in AOCL/I before reclassifications to income	0	0	0	0
Reclassifications from AOCI to income during the period	38	53	75	106
Other comprehensive income (loss), net of tax	38	53	75	106
Ending balance	(4,757)	(5,922)	(4,757)	(5,922)
Foreign Currency Translation Adjustments
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	(34,423)	(33,509)	(36,491)	(13,402)
Change in AOCL/I before reclassifications to income	3,335	6,224	5,403	(13,883)
Reclassifications from AOCI to income during the period	0	0	0	0
Other comprehensive income (loss), net of tax	3,335	6,224	5,403	(13,883)
Ending balance	(31,088)	(27,285)	(31,088)	(27,285)
AOCI Attributable to Parent
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	(49,430)	(42,328)	(44,402)	(21,170)
Change in AOCL/I before reclassifications to income	240	5,628	(6,049)	(16,336)
Reclassifications from AOCI to income during the period	1,187	1,083	2,448	1,889
Other comprehensive income (loss), net of tax	1,427	6,711	(3,601)	(14,447)
Ending balance	$ (48,003)	$ (35,617)	$ (48,003)	$ (35,617)