Consolidated Statements of Changes in Common Stockholders' Equity (USD $) In Thousands	Total	Parent [Member]	Common Stock	Treasury Stock	Additional Paid-in Capital	Retained Earnings/(Deficit)	Accumulated Other Comprehensive Income (Loss) [Member]
Balance, at Dec. 31, 2010		$ 859,780	$ 150	$ (892,012)	$ 1,963,092	$ (204,926)	$ (6,524)
Net (loss) income	302,150	302,150				302,150	0
Net foreign currency translation adjustment, net of tax	(21,040)	(21,040)					(21,040)
Net unrealized gain on investments, net of tax	39,328	39,328					39,328
Repurchases of common stock under incentive plans		(40)		(40)	0
Issuance of common stock under benefit plans		742	1		741
Amortization of restricted stock		1,837			1,837
Adjustments to Additional Paid in Capital, Stock Issued, Issuance Costs		(22)			(22)
Net actuarial gain (loss)		(364)					(364)
Stock-based compensation expense, net		1,250			1,250
Dividends declared		(1,330)			(333)	(997)
Balance, at Dec. 31, 2011		1,182,291	151	(892,052)	1,966,565	96,227	11,400
Net (loss) income	(451,468)	(451,468)				(451,468)
Net foreign currency translation adjustment, net of tax	(7)	(7)					(7)
Net unrealized gain on investments, net of tax	4,860	4,860					4,860
Repurchases of common stock under incentive plans		(42)		(42)	0
Issuance of common stock under benefit plans		489	0		489
Amortization of restricted stock		1,523			1,523
Net actuarial gain (loss)		(158)					(158)
Stock-based compensation expense, net		172			172
Dividends declared		(1,335)			(1,335)	0
Balance, at Dec. 31, 2012	736,325	736,325	151	(892,094)	1,967,414	(355,241)	16,095
Net (loss) income	(196,985)	(196,985)				(196,985)
Net foreign currency translation adjustment, net of tax	0
Net unrealized gain on investments, net of tax	21,090	21,090					21,090
Repurchases of common stock under incentive plans		(713)		(713)	0
Issuance of common stock - stock offering		299,410	39		299,371
Issuance of common stock under incentive plans		63	1	0	62
Issuance of common stock under benefit plans		672	0		672
Issuance of convertible debt (See Note 11)		77,026			77,026
Amortization of restricted stock		4,357			4,357
Net actuarial gain (loss)	0	198	0	0	0		198
Stock-based compensation expense, net		(166)			(166)
Dividends declared		1,632			1,632
Balance, at Dec. 31, 2013	$ 939,645	$ 939,645	$ 191	$ (892,807)	$ 2,347,104	$ (552,226)	$ 37,383