Condensed Consolidated Statements of Changes in Common Stockholders' Equity (Unaudited) (USD $) In Thousands	Total	Common Stock	Treasury Stock	Additional Paid-in Capital	Retained Earnings (Deficit)	Accumulated Other Comprehensive Income [Member]	Total Stockholders Equity
Balance, at Dec. 31, 2011		$ 151	$ (892,052)	$ 1,966,565	$ 96,227	$ 11,400	$ 1,182,291
Net (loss) income	(274,166)				(274,166)		(274,166)
Net foreign currency translation adjustment, net of tax	(7)					(7)	(7)
Net unrealized gain on investments, net of tax	6,497					6,497	6,497
Repurchases of common stock under incentive plans			(42)	0			(42)
Issuance of common stock under benefit plans		0		468			468
Amortization of restricted stock				1,311			1,311
Stock-based compensation expense				(98)			(98)
Dividends declared				(1,001)			(1,001)
Balance, at Sep. 30, 2012		151	(892,094)	1,967,245	(177,939)	17,890	915,253
Balance, at Dec. 31, 2012	736,325	151	(892,094)	1,967,414	(355,241)	16,095	736,325
Net (loss) income	(233,354)				(233,354)		(233,354)
Net foreign currency translation adjustment, net of tax	0
Net unrealized gain on investments, net of tax	13,045					13,045	13,045
Repurchases of common stock under incentive plans			(713)				(713)
Issuance of common stock - stock offering		39		299,371			299,410
Issuance of common stock under benefit plans		0		643			643
Amortization of restricted stock				3,883			3,883
Issuance of common stock under incentive plans		1		62			63
Issuance of convertible debt (See Note 10)				77,026			77,026
Stock-based compensation expense				(608)			(608)
Dividends declared				(1,200)			(1,200)
Balance, at Sep. 30, 2013	$ 894,520	$ 191	$ (892,807)	$ 2,346,591	$ (588,595)	$ 29,140	$ 894,520