Condensed Consolidating Financial Statements (Cash Flow) (Details) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016
Cash flows from operating activities:
Net cash provided by operating activities	$ 273,573	$ 426,592
Cash flows from investing activities:
Capital expenditures	(61,794)	(44,505)
Investments in and loans to investees	(43,000)	0
Increase to investment in affiliates	0	0
Payments for acquisition of a business, net of cash acquired	0	(354)
Net cash used in investing activities	(104,794)	(44,859)
Cash flows from financing activities:
Proceeds from the issuance of long-term debt	1,536,000	982,500
Principal payments on long-term debt	(1,257,965)	(811,000)
Payments for financing costs	(10,405)	(2,070)
Deemed repurchases of restricted stock units	(13,373)	(10,821)
Purchase of treasury stock	(347,334)	(109,997)
Principal payments on capital lease obligations	(3,428)	(3,182)
Distributions to noncontrolling interests	(16,110)	(9,010)
Premium and fees paid on extinguishment of debt	0	(40,953)
Proceeds from stock option exercises	0	1,217
Excess tax benefits from share-based compensation arrangements	0	764
Net cash (used in) provided by financing activities	(112,615)	(2,552)
Net (decrease) increase in cash and cash equivalents from operations	56,164	379,181
Effect of exchange rate changes on cash and cash equivalents	14,736	(12,738)
Cash and cash equivalents at beginning of period	481,389	316,321
Cash and cash equivalents at end of period	552,289	682,764
Consolidation, Eliminations [Member]
Cash flows from operating activities:
Net cash provided by operating activities	(611,888)	(476,390)
Cash flows from investing activities:
Capital expenditures	0	0
Investments in and loans to investees	0
Increase to investment in affiliates	429,994	323,341
Payments for acquisition of a business, net of cash acquired		0
Net cash used in investing activities	429,994	323,341
Cash flows from financing activities:
Proceeds from the issuance of long-term debt	0	0
Principal payments on long-term debt	0	0
Payments for financing costs	0	0
Deemed repurchases of restricted stock units	0	0
Purchase of treasury stock	0	0
Principal payments on capital lease obligations	0	0
Distributions to noncontrolling interests	0	0
Premium and fees paid on extinguishment of debt		0
Proceeds from stock option exercises		0
Excess tax benefits from share-based compensation arrangements		0
Net cash (used in) provided by financing activities	0	0
Net (decrease) increase in cash and cash equivalents from operations	(181,894)	(153,049)
Effect of exchange rate changes on cash and cash equivalents	181,894	153,049
Cash and cash equivalents at beginning of period	0	0
Cash and cash equivalents at end of period	0	0
Parent Company [Member]
Cash flows from operating activities:
Net cash provided by operating activities	374,873	347,413
Cash flows from investing activities:
Capital expenditures	0	0
Investments in and loans to investees	0
Increase to investment in affiliates	(289,891)	(359,772)
Payments for acquisition of a business, net of cash acquired		0
Net cash used in investing activities	(289,891)	(359,772)
Cash flows from financing activities:
Proceeds from the issuance of long-term debt	1,536,000	982,500
Principal payments on long-term debt	(1,257,965)	(811,000)
Payments for financing costs	(10,405)	(2,070)
Deemed repurchases of restricted stock units	(13,373)	(10,821)
Purchase of treasury stock	(347,334)	(109,997)
Principal payments on capital lease obligations	0	0
Distributions to noncontrolling interests	0	0
Premium and fees paid on extinguishment of debt		(40,953)
Proceeds from stock option exercises		1,217
Excess tax benefits from share-based compensation arrangements		764
Net cash (used in) provided by financing activities	(93,077)	9,640
Net (decrease) increase in cash and cash equivalents from operations	(8,095)	(2,719)
Effect of exchange rate changes on cash and cash equivalents	7,798	3,145
Cash and cash equivalents at beginning of period	565	434
Cash and cash equivalents at end of period	268	860
Guarantor Subsidiaries [Member]
Cash flows from operating activities:
Net cash provided by operating activities	498,874	504,454
Cash flows from investing activities:
Capital expenditures	(47,811)	(29,538)
Investments in and loans to investees	0
Increase to investment in affiliates	(394,117)	36,431
Payments for acquisition of a business, net of cash acquired		0
Net cash used in investing activities	(441,928)	6,893
Cash flows from financing activities:
Proceeds from the issuance of long-term debt	0	0
Principal payments on long-term debt	0	0
Payments for financing costs	0	0
Deemed repurchases of restricted stock units	0	0
Purchase of treasury stock	0	0
Principal payments on capital lease obligations	(2,019)	(1,834)
Distributions to noncontrolling interests	0	0
Premium and fees paid on extinguishment of debt		0
Proceeds from stock option exercises		0
Excess tax benefits from share-based compensation arrangements		0
Net cash (used in) provided by financing activities	(2,019)	(1,834)
Net (decrease) increase in cash and cash equivalents from operations	54,927	509,513
Effect of exchange rate changes on cash and cash equivalents	26,885	(153,049)
Cash and cash equivalents at beginning of period	320,950	148,260
Cash and cash equivalents at end of period	402,762	504,724
Non-Guarantor Subsidiaries [Member]
Cash flows from operating activities:
Net cash provided by operating activities	11,714	51,115
Cash flows from investing activities:
Capital expenditures	(13,983)	(14,967)
Investments in and loans to investees	(43,000)
Increase to investment in affiliates	254,014	0
Payments for acquisition of a business, net of cash acquired		(354)
Net cash used in investing activities	197,031	(15,321)
Cash flows from financing activities:
Proceeds from the issuance of long-term debt	0	0
Principal payments on long-term debt	0	0
Payments for financing costs	0	0
Deemed repurchases of restricted stock units	0	0
Purchase of treasury stock	0	0
Principal payments on capital lease obligations	(1,409)	(1,348)
Distributions to noncontrolling interests	(16,110)	(9,010)
Premium and fees paid on extinguishment of debt		0
Proceeds from stock option exercises		0
Excess tax benefits from share-based compensation arrangements		0
Net cash (used in) provided by financing activities	(17,519)	(10,358)
Net (decrease) increase in cash and cash equivalents from operations	191,226	25,436
Effect of exchange rate changes on cash and cash equivalents	(201,841)	(15,883)
Cash and cash equivalents at beginning of period	159,874	167,627
Cash and cash equivalents at end of period	$ 149,259	$ 177,180