Consolidated Statements of Shareholders' Equity (USD $) In Thousands, except Share data, unless otherwise specified	Total	Common Stock	Capital in Excess of Par Value	Retained Deficit	Accumulated Other Comprehensive Loss (note 14)
Balance, value at Dec. 31, 2010	$ 11,266	$ 197	$ 300,692	$ (178,677)	$ (110,946)
Balance, shares at Dec. 31, 2010		19,682,506
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		174,527
Exercise of warrants, value (note 6)	5,459	5	5,454
Warrants exercised, shares (note 6)		485,309
Balance value at Dec. 31, 2011	27,780	203	310,985	(155,036)	(128,372)
Balance, shares at Dec. 31, 2011		20,342,342
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		493,147
Balance value at Dec. 31, 2012	24,476	209	313,377	(148,070)	(141,040)
Balance, shares at Dec. 31, 2012		20,835,489
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	28,459			28,459
Other comprehensive income (loss)	67,880				67,880
Stock compensation expense (note 12)	5,063		5,063
Stock issued, value	4,931	4	4,927
Stock issued, shares		480,991
Balance value at Dec. 31, 2013	$ 130,809	$ 213	$ 323,367	$ (119,611)	$ (73,160)
Balance, shares at Dec. 31, 2013		21,316,480