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 at Dec. 31, 2015	$ 2,747,838	$ 8	$ 849	$ 1,143,020	$ 1,868,645	$ (282,631)	$ 17,947
Beginning Balance (in shares) at Dec. 31, 2015		770	84,853
Net (loss) 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	44,769		$ 6	44,763
Issuance of common stock for stock-based compensation awards and employee stock purchases (in shares)			661
Purchase and cancellation of treasury stock	(40,814)		$ (3)		(40,811)
Purchase and cancellation of treasury stock (in shares)			(361)
Purchase and cancellation of convertible preferred stock	(30,910)	$ (1)		(42,194)	11,285
Purchase and cancellation of convertible preferred stock (in shares)		(44)
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 at Dec. 31, 2016	2,816,386	$ 7	$ 852	1,166,457	2,006,064	(367,643)	10,649
Ending Balance (in shares) at Dec. 31, 2016		726	85,153
Net (loss) income	(85,635)				(85,853)		218
Currency translation adjustment	50,626					50,173	453
Change in qualifying cash flow hedge, net of tax	733					733
Issuance of common stock for stock-based compensation awards and employee stock purchases	8,218		$ 1	8,217
Issuance of common stock for stock-based compensation awards and employee stock purchases (in shares)			184
Purchase and cancellation of convertible preferred stock	(22,135)			(31,157)	9,022
Purchase and cancellation of convertible preferred stock (in shares)		(32)
Preferred stock dividend	(18,549)				(18,549)
Stock-based compensation expense	11,880			11,880
Reduction to noncontrolling interests due to additional ownership	(708)			(266)			(442)
Ending Balance at Jun. 30, 2017	$ 2,760,816	$ 7	$ 853	$ 1,155,131	$ 1,910,684	$ (316,737)	$ 10,878
Ending Balance (in shares) at Jun. 30, 2017		694	85,337