Statement of Shareholders' Equity (USD $) In Thousands, except Share data, unless otherwise specified	Total	Common Stock [Member]	Additional Paid-in Capital [Member]	Retained Earnings [Member]	Accumulated Other Comprehensive Income (Loss) [Member]	Noncontrolling Interest [Member]
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest at Dec. 31, 2008	$ 477,901	$ 483	$ 334,847	$ 46,921	$ 27,995	$ 67,655
Number of Shares Outstanding at Dec. 31, 2008		48,271,806
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net Income (Loss)	(332,254)			(345,766)		13,512
Pension and postretirement adjustment					6,386
Unrealized gains on hedging activities					4,357
Currency translation					16,684	712
Total comprehensive loss	(304,115)
Performance units vested		1	(1)
Performance units vested		101,899
Restricted stock compensation		10,500
Restricted stock compensation	253		253
Minimum tax withholding settlement	(226)		(226)
Capital contribution under tax sharing agreement	0
Noncontrolling interest distribution	(19,219)					(19,219)
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest at Dec. 31, 2009	154,594	484	334,873	(298,845)	55,422	62,660
Number of Shares Outstanding at Dec. 31, 2009		48,384,205
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net Income (Loss)	246,268			213,399		32,869
Pension and postretirement adjustment					(16,726)
Unrealized gains on hedging activities					(860)
Currency translation					(7,036)	3,157
Total comprehensive loss	224,803
Performance units vested		10,554
Restricted stock compensation		13,500
Restricted stock compensation	326		326
Minimum tax withholding settlement	(64)		(64)
Capital contribution under tax sharing agreement	14,919		14,919
Dividend distribution under tax sharing agreement	(1,765)		(1,765)
Noncontrolling interest distribution	(23,676)					(23,676)
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest at Dec. 31, 2010	369,137	484	348,289	(85,446)	30,800	75,010
Number of Shares Outstanding at Dec. 31, 2010		48,408,259
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net Income (Loss)	259,803			229,870		29,933
Pension and postretirement adjustment					(1,187)
Unrealized gains on hedging activities					(2,069)
Currency translation					(20,371)	2,541
Total comprehensive loss	238,717
Performance units vested		11,101
Restricted stock compensation		13,500
Restricted stock compensation	170		170
Minimum tax withholding settlement	(194)		(194)
Capital contribution under tax sharing agreement	0
Dividend distribution under tax sharing agreement	(12,928)		(12,928)
Noncontrolling interest distribution	(17,076)					(17,076)
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest at Dec. 31, 2011	$ 577,826	$ 484	$ 335,337	$ 144,424	$ 7,173	$ 90,408
Number of Shares Outstanding at Dec. 31, 2011		48,432,860