Consolidated Statements of Stockholders' Equity (USD $) In Thousands, except Share data, unless otherwise specified	Total	Common Stock	Additional Paid-In Capital	Accumulated Deficit	Accumulated Other Comprehensive Income (Loss)
Beginning balance at Dec. 31, 2009	$ 1,690,530	$ 8	$ 2,148,194	$ (458,685)	$ 1,013
Beginning balance, shares at Dec. 31, 2009		77,524,040
Components of comprehensive loss:
Net loss	(785,055)			(785,055)
Net unrealized holding losses on investments, net of tax	(254)				(254)
Less: reclassification adjustment for losses included in net loss, net of tax	(1,457)				(1,457)
Comprehensive loss	(786,766)
Share-based compensation expense	36,609		36,609
Accretion of redeemable non-controlling interests, net of tax	86,898		(86,898)
Issuance of common stock under share-based compensation plans, net of repurchases, shares		913,269
Issuance of common stock under share-based compensation plans, net of repurchases	1,535		1,535
Gain on formation of joint ventures, net of tax	56,272		56,272
Ending balance at Dec. 31, 2010	911,282	8	2,155,712	(1,243,740)	(698)
Ending balance, shares at Dec. 31, 2010		78,437,309
Components of comprehensive loss:
Net loss	(317,677)			(317,677)
Net unrealized holding losses on investments, net of tax	(14)				(14)
Less: reclassification adjustment for losses included in net loss, net of tax	0
Comprehensive loss	(317,691)
Share-based compensation expense	15,328		15,328
Accretion of redeemable non-controlling interests, net of tax	5,124		5,124
Issuance of common stock under share-based compensation plans, net of repurchases, shares		486,740
Issuance of common stock under share-based compensation plans, net of repurchases	1,346		1,346
Distributions to joint venture partners	(2,074)		2,074
Ending balance at Dec. 31, 2011	613,315	8	2,175,436	(1,561,417)	(712)
Ending balance, shares at Dec. 31, 2011		78,924,049
Components of comprehensive loss:
Net loss	(187,277)			(187,277)
Net unrealized holding losses on investments, net of tax	27				27
Less: reclassification adjustment for losses included in net loss, net of tax	0
Comprehensive loss	(187,250)
Share-based compensation expense	8,122		8,122
Accretion of redeemable non-controlling interests, net of tax	2,126		2,126
Issuance of common stock under share-based compensation plans, net of repurchases, shares		270,701
Issuance of common stock under share-based compensation plans, net of repurchases	960		960
Distributions to joint venture partners	(4,141)		(4,141)
Ending balance at Dec. 31, 2012	$ 433,132	$ 8	$ 2,182,503	$ (1,748,694)	$ (685)
Ending balance, shares at Dec. 31, 2012		79,194,750