Condensed Consolidated Statements of Changes in Common Stockholders' Equity (USD $) In Thousands	Total	Common Stock	Treasury Stock	Additional Paid-in Capital	Retained Earnings	Foreign Currency Translation Adjustment	Unrealized Holding Gains/(Losses)	Other Change in Stockholders Equity [Member]	Total Stockholders Equity
Balance, at Dec. 31, 2010		$ 150	$ (892,012)	$ 1,963,092	$ (204,926)	$ 21,094	$ (27,857)	$ 239	$ 859,780
Net (loss) income	103,006				103,006				103,006
Unrealized foreign currency translation adjustment, net of tax	1,565
Less: Reclassification adjustment for liquidation of foreign subsidiary and net gains on sales, net of tax	292
Net foreign currency translation adjustment, net of tax	1,857					1,857			1,857
Unrealized holding gains (losses) arising during the period, net of tax	8,066
Less: Reclassification adjustment for net gains (losses) included in net (loss) income, net of tax	(78)
Net unrealized gain on investments, net of tax	7,988						7,988		7,988
Comprehensive Income (Loss) Net of Tax	112,851
Repurchases of common stock under incentive plans			(24)	0					(24)
Issuance of common stock under benefit plans				359					359
Amortization of restricted stock				274					274
Additional convertible debt issuance costs, net				(33)					(33)
Stock-based compensation expense				23					23
Dividends declared				(333)	0				(333)
Balance, at Mar. 31, 2011		150	(892,036)	1,963,382	(101,920)	22,951	(19,869)	239	972,897
Balance, at Dec. 31, 2011	1,182,291	151	(892,052)	1,966,565	96,227	54	11,471	(125)	1,182,291
Net (loss) income	(169,232)				(169,232)				(169,232)
Unrealized foreign currency translation adjustment, net of tax	0
Less: Reclassification adjustment for liquidation of foreign subsidiary and net gains on sales, net of tax	0
Net foreign currency translation adjustment, net of tax	0
Unrealized holding gains (losses) arising during the period, net of tax	17,214
Less: Reclassification adjustment for net gains (losses) included in net (loss) income, net of tax	(9,610)
Net unrealized gain on investments, net of tax	7,604						7,604		7,604
Comprehensive Income (Loss) Net of Tax	(161,628)
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	$ 1,019,428	$ 151	$ (892,052)	$ 1,965,330	$ (73,005)	$ 54	$ 19,075	$ (125)	$ 1,019,428