Consolidated Statements of Shareholders' Equity (Deficit) (USD $) In Thousands, except Share data, unless otherwise specified	Total	Common Stock	Capital in Excess of Par Value	Treasury Stock	Retained Deficit	Accumulated Other Comprehensive Loss (note 14)
Balance, value at Dec. 31, 2008	$ (57,889)	$ 187	$ 309,275	$ (106,411)	$ (145,154)	$ (115,786)
Balance, shares at Dec. 31, 2008	14,730,144	18,697,630		(3,967,486)
Comprehensive income (loss):
Net income (loss)	(28,788)				(28,788)
Effect of derivatives - net of tax	12,440					12,440
Pension and other postretirement benefit adjustments - net of tax (notes 9 and 10)	(13,479)					(13,479)
Effect of exchange rate fluctuation	1,101					1,101
Total comprehensive income (loss) (note 14)	(28,726)
Stock compensation expense (note 12)	2,419		2,419
Equity issuance costs (note 6)	(1,800)		(1,800)
Stock issued from treasury, value	4,563		(148)	36,113	(31,402)
Stock issued, shares	1,367,717			1,367,717
Issuance of warrants (note 6)	14,526		14,526
Balance, value at Dec. 31, 2009	(66,907)	187	324,272	(70,298)	(205,344)	(115,724)
Balance, shares at Dec. 31, 2009	16,097,861	18,697,630		(2,599,769)
Comprehensive income (loss):
Net income (loss)	70,086				70,086
Effect of derivatives - net of tax	3,049					3,049
Pension and other postretirement benefit adjustments - net of tax (notes 9 and 10)	9,722					9,722
Effect of exchange rate fluctuation	(7,993)					(7,993)
Total comprehensive income (loss) (note 14)	74,864
Stock compensation expense (note 12)	3,496		3,496
Equity issuance costs (note 6)	145		145
Stock issued from treasury, value	(455)		(1,495)	2,302	(1,262)
Stock issued, value	88		88
Stock issued, shares	117,789	4,654		113,135
Exercise of warrants, value (note 6)	35	10	(25,814)	67,996	(42,157)
Warrants exercised, shares	3,466,856	980,222		2,486,634
Balance, value at Dec. 31, 2010	11,266	197	300,692	0	(178,677)	(110,946)
Balance, shares at Dec. 31, 2010	19,682,506	19,682,506		0
Comprehensive income (loss):
Net income (loss)	23,641				23,641
Effect of derivatives - net of tax	(1,249)					(1,249)
Pension and other postretirement benefit adjustments - net of tax (notes 9 and 10)	(14,833)					(14,833)
Effect of exchange rate fluctuation	(1,344)					(1,344)
Total comprehensive income (loss) (note 14)	6,215
Stock compensation expense (note 12)	5,016		5,016
Stock issued, value	(176)	1	(177)
Stock issued, shares	174,527	174,527
Exercise of warrants, value (note 6)	5,459	5	5,454
Warrants exercised, shares	485,309	485,309
Balance, value at Dec. 31, 2011	$ 27,780	$ 203	$ 310,985	$ 0	$ (155,036)	$ (128,372)
Balance, shares at Dec. 31, 2011	20,342,342	20,342,342		0