Condensed Consolidating Statements of Comprehensive Income (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Condensed Financial Statements, Captions [Line Items]
Net Income	$ 150,914	$ 142,785	$ 287,192	$ 254,956
Other comprehensive income (loss), net of tax:
Foreign currency translation	93,597	(73,257)	115,176	(73,117)
Net change in unrecognized gains/losses on derivative instruments, net of tax	(930)	(3,614)	2,233	(3,182)
Net change in unrealized gains/losses on pension plan, net of tax	(862)	120	(3,903)	267
Other comprehensive income (loss), unconsolidated subsidiaries	(439)		(601)
Total other comprehensive income (loss)	91,366	(76,751)	112,905	(76,032)
Total comprehensive income	242,280	66,034	400,097	178,924
Consolidation, Eliminations
Condensed Financial Statements, Captions [Line Items]
Net Income	(168,856)	(156,269)	(324,754)	(277,586)
Other comprehensive income (loss), net of tax:
Foreign currency translation	(103,000)	88,946	(128,010)	94,840
Net change in unrecognized gains/losses on derivative instruments, net of tax	0	(99)	133	(195)
Net change in unrealized gains/losses on pension plan, net of tax	862	(120)	3,903	(267)
Other comprehensive income (loss), unconsolidated subsidiaries	439		601
Total other comprehensive income (loss)	(101,699)	88,727	(123,373)	94,378
Total comprehensive income	(270,555)	(67,542)	(448,127)	(183,208)
Parent Company
Condensed Financial Statements, Captions [Line Items]
Net Income	150,914	142,785	287,192	254,956
Other comprehensive income (loss), net of tax:
Foreign currency translation	93,597	(73,257)	115,176	(73,117)
Net change in unrecognized gains/losses on derivative instruments, net of tax	(930)	(3,614)	2,233	(3,182)
Net change in unrealized gains/losses on pension plan, net of tax	(862)	120	(3,903)	267
Other comprehensive income (loss), unconsolidated subsidiaries	(439)		(601)
Total other comprehensive income (loss)	91,366	(76,751)	112,905	(76,032)
Total comprehensive income	242,280	66,034	400,097	178,924
Guarantor Subsidiaries
Condensed Financial Statements, Captions [Line Items]
Net Income	126,873	106,649	235,318	216,662
Other comprehensive income (loss), net of tax:
Foreign currency translation	10,097	(15,116)	13,975	(17,971)
Net change in unrecognized gains/losses on derivative instruments, net of tax	0	0	(133)	0
Net change in unrealized gains/losses on pension plan, net of tax	(448)	0	(3,253)	0
Other comprehensive income (loss), unconsolidated subsidiaries	0		0
Total other comprehensive income (loss)	9,649	(15,116)	10,589	(17,971)
Total comprehensive income	136,522	91,533	245,907	198,691
Non-Guarantor Subsidiaries
Condensed Financial Statements, Captions [Line Items]
Net Income	41,983	49,620	89,436	60,924
Other comprehensive income (loss), net of tax:
Foreign currency translation	92,903	(73,830)	114,035	(76,869)
Net change in unrecognized gains/losses on derivative instruments, net of tax	0	99	0	195
Net change in unrealized gains/losses on pension plan, net of tax	(414)	120	(650)	267
Other comprehensive income (loss), unconsolidated subsidiaries	(439)		(601)
Total other comprehensive income (loss)	92,050	(73,611)	112,784	(76,407)
Total comprehensive income	$ 134,033	$ (23,991)	$ 202,220	$ (15,483)