Condensed Consolidated Statements of Changes in Equity Statement - USD ($) $ in Thousands	Total	Common Stock	Additional Paid-in Capital	Treasury Stock	Accumulated Other Comprehensive Income	Accumulated Deficit	Total Equity	Non-controlling interest
Beginning balance (in shares) at Dec. 31, 2015		379,716,630		0
Beginning balance at Dec. 31, 2015	$ 1,041,860	$ 3,797	$ 1,127,951	$ 0	$ (1,671)	$ (88,217)	$ 1,041,860	$ 0
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Stock-based compensation and related tax effects	53,430		53,430				53,430
Stock option exercises and other (in shares)		16,002,465
Stock option exercises and other	10,969	$ 160	10,809				10,969
Treasury stock (in shares)		(2,282,700)		2,282,700
Treasury stock	(19,485)			$ (19,485)			(19,485)
ESPP purchase shares (in shares)		721,918
ESPP purchase shares	2,516	$ 7	2,509				2,516
Net unrealized gain on available for sale securities, net of tax	1,014				1,014		1,014
Excess tax benefit from share-based award activity	(62)		(62)				(62)
Net loss	(113,700)					(113,700)	(113,700)
Ending balance (in shares) at Sep. 30, 2016		394,158,313		2,282,700
Ending balance at Sep. 30, 2016	976,542	$ 3,964	1,194,637	$ (19,485)	(657)	(201,917)	976,542	0
Beginning balance (in shares) at Dec. 31, 2016		397,979,772		2,282,700
Beginning balance at Dec. 31, 2016	975,770	$ 4,003	1,226,206	$ (19,485)	(767)	(234,187)	975,770	0
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Stock-based compensation and related tax effects	62,078		63,475			(1,397)	62,078
Stock option exercises and other (in shares)		16,211,773
Stock option exercises and other	14,234	$ 162	14,072				14,234
ESPP purchase shares (in shares)		565,701
ESPP purchase shares	2,856	$ 5	2,851				2,856
Net unrealized gain on available for sale securities, net of tax	178				178		175	(3)
Contribution of interests in consolidated VIE							7,722	7,722
Dividends paid and return of capital to noncontrolling interests							1,037	1,037
Net loss	(61,828)					(61,828)	(61,947)	(119)
Ending balance (in shares) at Sep. 30, 2017		414,757,246		2,282,700
Ending balance at Sep. 30, 2017	$ 993,288	$ 4,170	$ 1,306,604	$ (19,485)	$ (589)	$ (297,412)	$ 999,851	$ 6,563