CONDENSED CONSOLIDATED STATEMENTS OF CHANGES IN EQUITY - USD ($) shares in Thousands, $ in Thousands	Total	Preferred Stock Series A preferred stock	Common Stock	Additional Paid-In Capital	Retained Earnings	Accumulated Other Comprehensive Income (Loss)	Noncontrolling Interest
Beginning Balance (in shares) at Dec. 31, 2014			84,884
Beginning Balance at Dec. 31, 2014	$ 1,917,185		$ 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, restricted stock units and employee stock purchases (in shares)			973
Issuance of common stock for exercise of options, restricted stock units 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	77,595				76,786		809
Currency translation adjustment	17,164					17,102	62
Change in qualifying cash flow hedge, net of tax	511					511
Issuance of common stock for exercise of options, restricted stock units and employee stock purchases (in shares)			305
Issuance of common stock for exercise of options, restricted stock units and employee stock purchases	22,873		$ 3	22,870
Purchase and cancellation of treasury stock (in shares)			(328)
Purchase and cancellation of treasury stock	(37,693)		$ (4)		(37,689)
Preferred stock dividend	(10,106)				(10,106)
Stock compensation expense	6,105			6,105
Reduction to noncontrolling interests due to additional ownership	(5,798)			967			(6,765)
Ending Balance (in shares) at Mar. 31, 2016		770	84,830
Ending Balance at Mar. 31, 2016	$ 2,818,489	$ 8	$ 848	$ 1,172,962	$ 1,897,636	$ (265,018)	$ 12,053