Condensed Consolidated Statement of Shareholders' Equity Statement - 9 months ended Sep. 30, 2015 - USD ($) $ in Thousands	Total	Common Stock	Treasury Stock	Capital in Excess of Par Value	Retained Deficit	Accumulated Other Comprehensive Loss (note 10)
Balance, value at Dec. 31, 2014	$ 77,454	$ 218	$ (1,060)	$ 331,391	$ (114,648)	$ (138,447)
Balance, shares at Dec. 31, 2014		21,843,851	34,985
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)	34,225				34,225
Other comprehensive income	2,704					2,704
Stock compensation expense	4,521			4,521
Dividends	(7,197)				(7,197)
Stock withheld for employee taxes	(719)			(719)
Stock issued, value	3,364		$ 11,741	(8,377)
Stock issued, shares			(333,069)
Purchase of treasury shares, value	(15,275)		$ (15,275)
Purchase of treasury shares, shares			412,473
Balance, value at Sep. 30, 2015	$ 99,077	$ 218	$ (4,594)	$ 326,816	$ (87,620)	$ (135,743)
Balance, shares at Sep. 30, 2015		21,843,851	114,389