Consolidated Statements of Changes in Common Stockholders' Equity (USD $) In Thousands, unless otherwise specified	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, 2008		$ 2,030,710	$ 98	$ (888,057)	$ 1,350,704	$ 1,766,946	$ 13,966	$ (196,480)	$ (16,467)
Effect of Adoption of Accounting Standard (Accounting Standards Update 2009-08)		(37,587)				(37,587)
Balance, as adjusted		1,993,123	98	(888,057)	1,350,704	1,729,359	13,966	(196,480)	(16,467)
Balance, at Jan. 02, 2009
Effect of Adoption of Accounting Standard (Accounting Standards Update 2009-08)	21,500	0				21,490		(21,490)
Comprehensive Income (Loss)
Net income (loss)		(147,879)				(147,879)
Unrealized foreign currency translation adjustment, net of tax		4,319					4,319
Unrealized holding gains (losses) arising during the period, net of tax								199,700
Less: Reclassification adjustment for unrealized gains or losses realized upon the sale of securities, net of tax								54,532
Net unrealized gain on investments, net of tax		145,168						145,168
Total comprehensive income (loss)		1,608
Repurchases of common stock under incentive plans		(38)		(1,439)	1,401
Issuance of common stock under benefit plans		3,745	2		3,743
Amortization of restricted stock		3,388			3,388
Net actuarial loss		(24)							(24)
Stock-based compensation expense		4,019			4,019
Dividends declared		(827)				(827)
Balance, at Dec. 31, 2009		2,004,994	100	(889,496)	1,363,255	1,602,143	18,285	(72,802)	(16,491)
Comprehensive Income (Loss)
Net income (loss)	(1,805,867)	(1,805,867)				(1,805,867)
Unrealized foreign currency translation adjustment, net of tax							3,328
Less: Reclassification adjustment for liquidation of foreign subsidiary and net gains on sales, net of tax							519
Net foreign currency translation adjustment, net of tax		2,809					2,809
Unrealized holding gains (losses) arising during the period, net of tax								41,164
Less: Reclassification adjustment for unrealized gains or losses realized upon the sale of securities, net of tax								(3,781)
Net unrealized gain on investments, net of tax		44,945						44,945
Total comprehensive income (loss)		(1,758,113)
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		905			905
Dividends declared		(1,202)				(1,202)
Balance, at Dec. 31, 2010	859,780	859,780	150	(892,012)	1,963,092	(204,926)	21,094	(27,857)	239
Comprehensive Income (Loss)
Net income (loss)	302,150	302,150				302,150
Unrealized foreign currency translation adjustment, net of tax							6,265
Less: Reclassification adjustment for liquidation of foreign subsidiary and net gains on sales, net of tax							27,305
Net foreign currency translation adjustment, net of tax		(21,040)					(21,040)
Unrealized holding gains (losses) arising during the period, net of tax								7,400
Less: Reclassification adjustment for unrealized gains or losses realized upon the sale of securities, net of tax								(31,928)
Net unrealized gain on investments, net of tax		39,328						39,328
Total comprehensive income (loss)		320,438
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		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)