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, 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
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	70,086				70,086
Other comprehensive income (loss)	4,778					4,778
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 (note 2)	117,789	4,654		113,135
Exercise of warrants, value (note 6)	35	10	(25,814)	67,996	(42,157)
Warrants exercised, shares (note 6)	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
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	23,641				23,641
Other comprehensive income (loss)	(17,426)					(17,426)
Stock compensation expense (note 12)	5,016		5,016
Stock issued, value	(176)	1	(177)
Stock issued, shares (note 2)	174,527	174,527
Exercise of warrants, value (note 6)	5,459	5	5,454
Warrants exercised, shares (note 6)	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
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	6,966				6,966
Other comprehensive income (loss)	(12,668)					(12,668)
Stock compensation expense (note 12)	3,321		3,321
Stock issued, value	(923)	6	(929)
Stock issued, shares (note 2)	493,147	493,147
Balance, value at Dec. 31, 2012	$ 24,476	$ 209	$ 313,377	$ 0	$ (148,070)	$ (141,040)
Balance, shares at Dec. 31, 2012	20,835,489	20,835,489		0