Consolidated Statements of Changes in Common Stockholders' Equity (USD $) In Thousands	Total		Parent [Member]	Common Stock	Treasury Stock	Additional Paid-in Capital	Retained Earnings	Foreign Currency Translation Adjustment	Unrealized Holding Gains/(Losses)	Other Change in Stockholders Equity
Balance, at Dec. 31, 2009			$ 2,004,994	$ 100	$ (889,496)	$ 1,363,255	$ 1,602,143	$ 18,285	$ (72,802)	$ (16,491)
Net (loss) income	(1,805,867)		(1,805,867)				(1,805,867)
Net foreign currency translation adjustment, net of tax	2,809		2,809					2,809
Net unrealized gain on investments, net of tax	44,945		44,945						44,945
Sherman unrealized loss included in net loss			16,761							16,761
Repurchases of common stock under incentive plans			(2,408)		(2,516)	108
Issuance of common stock - stock offering			525,887	50		525,837
Issuance of common stock under benefit plans			3,977			3,977
Amortization of restricted stock			3,309			3,309
Additional convertible debt issuance costs, net (See Note 13)			65,701			65,701
Net actuarial loss			(31)							(31)
Stock-based compensation expense	(20,369)	[1]	905			905
Dividends declared			(1,202)				(1,202)
Balance, at Dec. 31, 2010			859,780	150	(892,012)	1,963,092	(204,926)	21,094	(27,857)	239
Net (loss) income	302,150		302,150				302,150
Net foreign currency translation adjustment, net of tax	(21,040)		(21,040)					(21,040)
Net unrealized gain on investments, net of tax	39,328		39,328						39,328
Repurchases of common stock under incentive plans			(40)		(40)
Issuance of common stock under benefit plans			742	1		741
Amortization of restricted stock			1,837			1,837
Additional convertible debt issuance costs, net (See Note 13)			(22)			(22)
Net actuarial loss			(364)							(364)
Stock-based compensation expense	969	[1]	1,250			1,250
Dividends declared			(1,330)			(333)	(997)
Balance, at Dec. 31, 2011	1,182,291		1,182,291	151	(892,052)	1,966,565	96,227	54	11,471	(125)
Net (loss) income	(451,468)		(451,468)				(451,468)
Net foreign currency translation adjustment, net of tax	(7)		(7)					(7)
Net unrealized gain on investments, net of tax	4,860		4,860						4,860
Repurchases of common stock under incentive plans			(42)		(42)
Issuance of common stock under benefit plans			489	0		489
Amortization of restricted stock			1,523			1,523
Net actuarial loss			(158)							(158)
Stock-based compensation expense	(28,366)	[1]	172			172
Dividends declared			(1,335)			(1,335)	0
Balance, at Dec. 31, 2012	$ 736,325		$ 736,325	$ 151	$ (892,094)	$ 1,967,414	$ (355,241)	$ 47	$ 16,331	$ (283)

[1] For purposes of calculating compensation cost recognized, we consider awards effectively vested (and we recognize the full compensation costs) when grantees become retirement eligible. Under the terms of our awards, legal vesting upon retirement occurs when the grantee actually separates from service, except for awards granted to certain senior executives in which case vesting remains dependent on performance for the full term of the awards notwithstanding an executive’s early retirement.