Condensed Consolidated Statement of Shareholders' Equity Statement - 9 months ended Sep. 30, 2016 - USD ($) $ in Thousands	Total	Common Stock	Treasury Stock	Capital in Excess of Par Value	Retained Deficit	Accumulated Other Comprehensive Loss (note 9)
Balance, value at Dec. 31, 2015	$ 148,382	$ 218	$ (4,448)	$ 330,756	$ (57,912)	$ (120,232)
Balance, shares at Dec. 31, 2015		21,843,851	110,717
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	12,322				12,322
Other comprehensive income	4,701					4,701
Stock compensation expense	3,367			3,367
Income tax effect from share-based compensation arrangements	(396)			(396)
Dividends	(7,551)				(7,551)
Stock withheld for employee taxes	(862)			(862)
Stock issued, value	1,183		$ 6,440	(3,541)
Stock issued, value lower than repurchase price					(1,716)
Stock issued, shares			(221,536)
Purchase of treasury shares, value	(2,000)		$ (2,000)
Purchase of treasury shares, shares			111,292
Balance, value at Sep. 30, 2016	$ 159,146	$ 218	$ (8)	$ 329,324	$ (54,857)	$ (115,531)
Balance, shares at Sep. 30, 2016		21,843,851	473