CONSOLIDATED STATEMENTS OF CHANGES IN STOCKHOLDERS' EQUITY - USD ($) $ in Thousands	Common Stock [Member]	Additional Paid-in Capital [Member]	Treasury Stock [Member]	Retained Earnings (Accumulated Deficit) [Member]	Accumulated Other Comprehensive Loss [Member]	Total
BALANCE at Dec. 31, 2014	$ 141,377	$ 26,350	$ (82,860)	$ 5,610	$ (7,467)	$ 83,010
BALANCE (in shares) at Dec. 31, 2014	29,933,086
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net loss	$ 0	0	0	(3,350)	0	(3,350)
Employee pension plan adjustments	0	0	0	0	395	395
Stock-based compensation expense
Restricted stock	$ 0	1,095	0	0	0	1,095
Restricted stock (in shares)	(119,791)
Stock options	$ 0	33	0	0	0	33
Net share settlement for equity-based compensation	$ 0	(186)	0	0	0	(186)
Net share settlement for equity-based compensation (in shares)	(85,740)
BALANCE at Dec. 31, 2015	$ 141,377	27,292	(82,860)	2,260	(7,072)	80,997
BALANCE (in shares) at Dec. 31, 2015	29,727,555
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net loss	$ 0	0	0	(28,304)	0	(28,304)
Employee pension plan adjustments	0	0	0	0	971	971
Stock-based compensation expense
Restricted stock	$ 0	1,440	0	0	0	1,440
Restricted stock (in shares)	1,029,267
Net share settlement for equity-based compensation	$ 0	(178)	0	0	0	(178)
Net share settlement for equity-based compensation (in shares)	(71,805)
BALANCE at Dec. 31, 2016	$ 141,377	28,554	(82,860)	(26,044)	(6,101)	$ 54,926
BALANCE (in shares) at Dec. 31, 2016	30,685,017					30,685,017
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net loss	$ 0	0	0	(11,484)	0	$ (11,484)
Employee pension plan adjustments	0	0	0	0	1,591	1,591
Stock-based compensation expense
Restricted stock	$ 0	1,220	0	0	0	1,220
Restricted stock (in shares)	128,810
Net share settlement for equity-based compensation	$ 0	(440)	0	0	0	(440)
Net share settlement for equity-based compensation (in shares)	(189,420)
BALANCE at Dec. 31, 2017	$ 141,377	$ 29,334	$ (82,860)	$ (37,528)	$ (4,510)	$ 45,813
BALANCE (in shares) at Dec. 31, 2017	30,624,407					30,624,407