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 (Loss) [Member]	Total Stockholders Equity
Balance, at Dec. 31, 2011		$ 151	$ (892,052)	$ 1,966,565	$ 96,227	$ 11,400	$ 1,182,291
Net loss	(288,491)				(288,491)		(288,491)
Net foreign currency translation adjustment, net of tax	(8)					(8)	(8)
Net unrealized gain on investments, net of tax	6,926					6,926	6,926
Repurchases of common stock under incentive plans			(32)	0			(32)
Issuance of common stock under benefit plans		0		213			213
Amortization of restricted stock				1,101			1,101
Stock-based compensation expense				(446)			(446)
Dividends declared				(666)	0		(666)
Balance, at Jun. 30, 2012		151	(892,084)	1,966,767	(192,264)	18,318	900,888
Balance, at Dec. 31, 2012	736,325	151	(892,094)	1,967,414	(355,241)	16,095	736,325
Net loss	(220,672)				(220,672)		(220,672)
Net foreign currency translation adjustment, net of tax	0
Net unrealized gain on investments, net of tax	8,371					8,371	8,371
Repurchases of common stock under incentive plans			(716)				(716)
Issuance of common stock - stock offering		39		299,503			299,542
Issuance of common stock under benefit plans		0		298			298
Issuance of common stock under incentive plans		1		62			63
Amortization of restricted stock				3,375			3,375
Issuance of convertible debt (See Note 10)				77,026			77,026
Stock-based compensation expense				21			21
Dividends declared				(767)	0		(767)
Balance, at Jun. 30, 2013	$ 902,866	$ 191	$ (892,810)	$ 2,346,932	$ (575,913)	$ 24,466	$ 902,866