CONSOLIDATED STATEMENTS OF CHANGES IN EQUITY - USD ($) shares in Thousands, $ in Thousands	Total	Preferred Stock	Common Stock	Additional Paid-In Capital	Retained Earnings	Accumulated Other Comprehensive Income (Loss)	Noncontrolling Interests
Beginning Balance (in shares) at Dec. 31, 2013		0	85,500
Beginning Balance at Dec. 31, 2013	$ 1,767,538	$ 0	$ 855	$ 195,110	$ 1,610,964	$ (56,468)	$ 17,077
Net Income	328,146				326,456		1,690
Currency translation adjustment	(82,871)					(80,221)	(2,650)
Change in qualifying cash flow hedge, net of tax	(1,730)					(1,730)
Issuance of common stock for exercise of options and employee stock purchases (in shares)			1,061
Issuance of common stock for exercise of options and employee stock purchases	58,562		$ 11	58,551
Purchase and cancellation of treasury stock (in shares)			(1,677)
Purchase and cancellation of treasury stock	(194,066)		$ (17)		(194,049)
Stock compensation expense	17,773			17,773
Excess tax benefit of stock options exercised	17,906			17,906
Noncontrolling interests attributable to acquisitions	6,781						6,781
Reduction to noncontrolling interests due to additional ownership	(854)			(129)			(725)
Ending Balance (in shares) at Dec. 31, 2014		0	84,884
Ending Balance at Dec. 31, 2014	1,917,185	$ 0	$ 849	289,211	1,743,371	(138,419)	22,173
Net Income	268,013				267,046		967
Currency translation adjustment	(140,648)					(140,809)	161
Change in qualifying cash flow hedge, net of tax	(3,403)					(3,403)
Issuance of common stock for exercise of options and employee stock purchases (in shares)			973
Issuance of common stock for exercise of options and employee stock purchases	68,640		$ 10	68,630
Issuance of mandatory convertible preferred stock (in shares)		770
Issuance of mandatory convertible preferred stock	746,900	$ 8		746,892
Purchase and cancellation of treasury stock (in shares)			(1,004)
Purchase and cancellation of treasury stock	(131,676)		$ (10)		(131,666)
Preferred stock dividend	(10,106)				(10,106)
Stock compensation expense	21,750			21,750
Excess tax benefit of stock options exercised	16,897			16,897
Reduction to noncontrolling interests due to additional ownership	(5,714)			(360)			(5,354)
Ending Balance (in shares) at Dec. 31, 2015		770	84,853
Ending Balance at Dec. 31, 2015	2,747,838	$ 8	$ 849	1,143,020	1,868,645	(282,631)	17,947
Net Income	207,899				206,359		1,540
Currency translation adjustment	(86,575)					(86,340)	(235)
Change in qualifying cash flow hedge, net of tax	1,328					1,328
Issuance of common stock for exercise of options and employee stock purchases (in shares)			661
Issuance of common stock for exercise of options and employee stock purchases	44,769		$ 6	44,763
Purchase and cancellation of treasury stock (in shares)			(361)
Purchase and cancellation of treasury stock	(40,814)		$ (3)		(40,811)
Purchase and cancellation of convertible preferred stock (in shares)		(44)
Purchase and cancellation of convertible preferred stock	(30,910)	$ (1)		(42,194)	11,285
Preferred stock dividend	(39,414)				(39,414)
Stock compensation expense	20,455			20,455
Reduction to noncontrolling interests due to additional ownership	(8,190)			413			(8,603)
Ending Balance (in shares) at Dec. 31, 2016		726	85,153
Ending Balance at Dec. 31, 2016	$ 2,816,386	$ 7	$ 852	$ 1,166,457	$ 2,006,064	$ (367,643)	$ 10,649