Condensed Consolidated Statements of Changes in Common Stockholders' Equity (Unaudited) (USD $) In Thousands	Total	Common Stock	Treasury Stock	Additional Paid-in Capital	Retained Earnings	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	(169,232)				(169,232)		(169,232)
Net foreign currency translation adjustment, net of tax	0
Net unrealized gain on investments, net of tax	7,604					7,604	7,604
Issuance of common stock under benefit plans		0		190			190
Amortization of restricted stock				123			123
Stock-based compensation expense				(1,215)			(1,215)
Dividends declared				(333)	0		(333)
Balance, at Mar. 31, 2012		151	(892,052)	1,965,330	(73,005)	19,004	1,019,428
Balance, at Dec. 31, 2012	736,325	151	(892,094)	1,967,414	(355,241)	16,095	736,325
Net loss	(187,500)				(187,500)		(187,500)
Net foreign currency translation adjustment, net of tax	(19)					(19)	(19)
Net unrealized gain on investments, net of tax	7,464					7,464	7,464
Issuance of common stock - stock offering		39		299,503			299,542
Issuance of common stock under benefit plans		0		271			271
Issuance of common stock under incentive plans				62			62
Amortization of restricted stock				208			208
Issuance of convertible debt (See Note 10)				77,026			77,026
Stock-based compensation expense				(1,999)			(1,999)
Dividends declared				(334)	0		(334)
Balance, at Mar. 31, 2013	$ 931,046	$ 190	$ (892,094)	$ 2,342,151	$ (542,741)	$ 23,540	$ 931,046