Consolidated Statement of Stockholders' Equity and Comprehensive Income (USD $) In Thousands, except Share data	Total	Parent [Member]	Common Stock [Member]	Additional Paid-in Capital [Member]	Accumulated Deficit [Member]	Accumulated Other Comprehensive Income (Loss) [Member]	Treasury Stock [Member]	Noncontrolling Interest [Member]
Balance at beginning of period at Dec. 31, 2008	$ 243,163	$ 237,139	$ 183	$ 1,496,976	$ (1,278,221)	$ 18,201		$ 6,024
Balance at beginning of period, shares at Dec. 31, 2008			183,035,000
Net income	156,283	155,980			155,980			303
Adjustments to unrealized components of defined benefit pension plan, net of tax	(12,632)	(12,632)				(12,632)
Cumulative translation adjustment	(383)	(548)				(548)		165
Comprehensive income	143,268	142,800						468
Issuance of stock through share-based compensation plans	693	693		693
Share-based compensation expense	2,577	2,577		2,577
Issuance of stock through share-based compensation plans, shares			136,000
Balance at end of period at Dec. 31, 2009	389,701	383,209	183	1,500,246	(1,122,241)	5,021		6,492
Balance at end of period, shares at Dec. 31, 2009			183,171,000
Net income	232,147	231,971			231,971			176
Adjustments to unrealized components of defined benefit pension plan, net of tax	2,270	2,270				2,270
Cumulative translation adjustment	8,166	8,166				8,166
Comprehensive income	242,583	242,407						176
Treasury stock acquired through surrender of shares for tax withholding	(284)	(284)					(284)
Treasury stock acquired through surrender of shares for tax withholding, shares							(47,000)
Issuance of stock through share-based compensation plans	1,166	1,166		1,166
Share-based compensation expense	3,515	3,515		3,515
Issuance of stock through share-based compensation plans, shares			296,000
Balance at end of period at Dec. 31, 2010	636,681	630,013	183	1,504,927	(890,270)	15,457	(284)	6,668
Balance at end of period, shares at Dec. 31, 2010	183,420,000		183,467,000				47,000
Net income	93,095	91,808			91,808			1,287
Adjustments to unrealized components of defined benefit pension plan, net of tax	(5,800)	(5,800)				(5,800)
Cumulative translation adjustment	1,192	1,192				1,192
Comprehensive income	88,487	87,200						1,287
Conversion of debt to common stock	100,497	100,497	13	100,484
Repurchase of common stock	(129,500)	(129,500)					(129,500)
Treasury stock acquired through surrender of shares for tax withholding	(776)	(776)					(776)
Treasury stock acquired through surrender of shares for tax withholding, shares							(111,000)
Issuance of stock through share-based compensation plans	822	822	1	821
Share-based compensation expense	5,010	5,010		5,010
Conversion of debt to common stock, shares			13,351,000
Repurchase of common stock, number of shares							(28,573,000)
Issuance of stock through share-based compensation plans, shares			541,000
Balance at end of period at Dec. 31, 2011	$ 701,221	$ 693,266	$ 197	$ 1,611,242	$ (798,462)	$ 10,849	$ (130,560)	$ 7,955
Balance at end of period, shares at Dec. 31, 2011	168,628,000		197,359,000				28,731,000