Consolidated Statements of Shareholders' Equity - USD ($) $ in Thousands	Total	Common Stock	Capital in Excess of Par Value	Retained Deficit	Accumulated Other Comprehensive Loss
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Cumulative-effect adjustment | Accounting Standards Update 2016-09	$ 2,310		$ 127	$ 2,183
Balance, value at Dec. 31, 2016	145,119	$ 219	329,722	(59,625)	$ (125,197)
Balance, shares at Dec. 31, 2016		21,864,541
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net loss	(93,368)			(93,368)
Other comprehensive income (loss)	20,025				20,025
Stock compensation expense	3,372		3,372
Stock issued, value	418	$ 1	417
Stock issued, shares		153,469
Stock withheld for employee taxes	(627)		(627)
Dividends	(10,355)			(10,355)
Balance value at Dec. 31, 2017	66,894	$ 220	333,011	(161,165)	(105,172)
Balance, shares at Dec. 31, 2017		22,018,010
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Cumulative-effect adjustment | Accounting Standards Update 2017-12	0			275	(275)
Net loss	(7,956)			(7,956)
Other comprehensive income (loss)	(8,958)				(8,958)
Stock compensation expense	2,746		2,746
Stock issued, value	98	$ 2	96
Stock issued, shares		139,210
Stock withheld for employee taxes	(336)		(336)
Dividends	(2,595)			(2,595)
Balance value at Dec. 31, 2018	$ 49,893	$ 222	$ 335,517	$ (171,441)	$ (114,405)
Balance, shares at Dec. 31, 2018		22,157,220