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 common stock (in shares)			(1,004)
Purchase and cancellation of common 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	123,825				122,820		1,005
Currency translation adjustment	(15,782)					(15,837)	55
Change in qualifying cash flow hedge, net of tax	910					910
Issuance of common stock for exercise of options, restricted stock units and employee stock purchases (in shares)			473
Issuance of common stock for exercise of options, restricted stock units and employee stock purchases	34,460		$ 4	34,456
Purchase and cancellation of common stock (in shares)			(361)
Purchase and cancellation of common stock	(40,814)		$ (3)		(40,811)
Purchase and cancellation of convertible preferred stock (in shares)		(6)
Purchase and cancellation of convertible preferred stock	(5,025)	$ 0		(6,305)	1,280
Preferred stock dividend	(20,127)				(20,127)
Stock compensation expense	11,557			11,557
Reduction to noncontrolling interests due to additional ownership	(7,763)			412			(8,175)
Ending Balance (in shares) at Jun. 30, 2016		764	84,965
Ending Balance at Jun. 30, 2016	$ 2,829,079	$ 8	$ 850	$ 1,183,140	$ 1,931,807	$ (297,558)	$ 10,832