CONDENSED 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 Loss	Noncontrolling Interests
Beginning Balance (in shares) at Dec. 31, 2015		770	84,853
Beginning 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 stock-based compensation awards and employee stock purchases			661
Issuance of common stock for stock-based compensation awards 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-based 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
Net Income	58,557				58,189		368
Currency translation adjustment	26,525					26,237	288
Change in qualifying cash flow hedge, net of tax	287					287
Issuance of common stock for stock-based compensation awards and employee stock purchases			109
Issuance of common stock for stock-based compensation awards and employee stock purchases	3,661		$ 1	3,660
Purchase and cancellation of convertible preferred stock (in shares)		(14)
Purchase and cancellation of convertible preferred stock	(9,570)			(14,133)	4,563
Preferred stock dividend	(9,364)				(9,364)
Stock-based compensation expense	5,999			5,999
Ending Balance (in shares) at Mar. 31, 2017		712	85,262
Ending Balance at Mar. 31, 2017	$ 2,892,481	$ 7	$ 853	$ 1,161,983	$ 2,059,452	$ (341,119)	$ 11,305