Statement of Equity Statement - USD ($) shares in Thousands, $ in Thousands	Total	Retained Earnings [Member]	Treasury Stock [Member]	AOCI Attributable to Parent [Member]	Additional Paid-in Capital [Member]	Common Stock [Member]
Shares, Issued			3,751			293,938
Stockholders' Equity Attributable to Parent	$ 1,931,382	$ (580,027)	$ (16,788)	$ (101,342)	$ 2,629,245	$ 294
New Accounting Pronouncement or Change in Accounting Principle, Effect of Change on Net Income	(882)	(882)
Stock Issued During Period, Shares, Employee Stock Purchase Plans						7,995
Stock Issued During Period, Value, Employee Stock Purchase Plan	(9,359)				(9,351)	$ (8)
Cancellation of Restricted Stock and Repurchase of Common Stock at Cost for Employee Tax Withholding, Shares						2,684
Cancellation of Restricted Stock and Repurchase of Common Stock at Cost for Employee Tax Withholding, Value	42,349				42,346	$ 3
Adjustments to Additional Paid in Capital, Share-based Compensation, Requisite Service Period Recognition	$ 117,294				117,294
Stock Repurchased and Retired During Period, Shares	8,100					8,107
Stock Repurchased and Retired During Period, Value	$ 111,979				111,971	$ 8
Net income (loss)	(124,862)	(124,862)
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent	(20,048)			(20,048)
Shares, Issued			3,751			298,330
Stockholders' Equity Attributable to Parent	1,893,682	(691,734)	$ (16,788)	(95,963)	2,697,869	$ 298
Stock Issued During Period, Shares, Employee Stock Purchase Plans						1,452
Stock Issued During Period, Value, Employee Stock Purchase Plan	(1)				(3)	$ (2)
Cancellation of Restricted Stock and Repurchase of Common Stock at Cost for Employee Tax Withholding, Shares						533
Cancellation of Restricted Stock and Repurchase of Common Stock at Cost for Employee Tax Withholding, Value	7,842				7,841	$ 1
Adjustments to Additional Paid in Capital, Share-based Compensation, Requisite Service Period Recognition	23,519				23,519
Stock Repurchased and Retired During Period, Shares						8,107
Stock Repurchased and Retired During Period, Value	111,979				111,971	$ 8
Net income (loss)	(14,037)	(14,037)
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent	(25,427)			(25,427)
Shares, Issued			3,751			291,142
Stockholders' Equity Attributable to Parent	1,757,915	(705,771)	$ (16,788)	(121,390)	2,601,573	$ 291
Shares, Issued			3,751			291,504
Stockholders' Equity Attributable to Parent	1,717,496	(740,837)	$ (16,788)	(122,863)	2,597,693	$ 291
New Accounting Pronouncement or Change in Accounting Principle, Effect of Change on Net Income	233,415	233,415
Stock Issued During Period, Shares, Employee Stock Purchase Plans						7,225
Stock Issued During Period, Value, Employee Stock Purchase Plan	(8,643)				(8,635)	$ (8)
Cancellation of Restricted Stock and Repurchase of Common Stock at Cost for Employee Tax Withholding, Shares						2,229
Cancellation of Restricted Stock and Repurchase of Common Stock at Cost for Employee Tax Withholding, Value	35,852				35,850	$ 2
Adjustments to Additional Paid in Capital, Share-based Compensation, Requisite Service Period Recognition	$ 128,499				128,499
Stock Repurchased and Retired During Period, Shares	7,800					7,770
Stock Repurchased and Retired During Period, Value	$ 120,935				120,927	$ 8
Disposal Group, Including Discontinued Operation, Foreign Currency Translation Gains (Losses)	5,605			5,605
Net income (loss)	105,681
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent	446			446
Shares, Issued			3,751			290,038
Stockholders' Equity Attributable to Parent	2,044,747	(411,000)	$ (16,788)	(120,463)	2,592,708	$ 290
Stock Issued During Period, Shares, Employee Stock Purchase Plans						646
Stock Issued During Period, Value, Employee Stock Purchase Plan	0				1	$ (1)
Cancellation of Restricted Stock and Repurchase of Common Stock at Cost for Employee Tax Withholding, Shares						247
Cancellation of Restricted Stock and Repurchase of Common Stock at Cost for Employee Tax Withholding, Value	4,292				4,292	$ 0
Adjustments to Additional Paid in Capital, Share-based Compensation, Requisite Service Period Recognition	$ 19,247				19,247
Stock Repurchased and Retired During Period, Shares	1,700					1,707
Stock Repurchased and Retired During Period, Value	$ 29,614				29,612	$ 2
Net income (loss)	9,259
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent	3,651			3,651
Shares, Issued			3,751			288,730
Stockholders' Equity Attributable to Parent	$ 2,042,998	$ (401,741)	$ (16,788)	$ (116,812)	$ 2,578,050	$ 289