CONDENSED CONSOLIDATED STATEMENTS OF CHANGES IN STOCKHOLDERS' EQUITY (Unaudited) - 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, 2016	$ 141,377	$ 28,554	$ (82,860)	$ (26,044)	$ (6,101)	$ 54,926
BALANCE (in shares) at Dec. 31, 2016	30,685,017
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net loss	$ 0	0	0	(10,929)	0	(10,929)
Employee pension plan adjustments	0	0	0	0	220	220
Stock-based compensation expense
Restricted stock	$ 0	361	0	0	0	361
Restricted stock (in shares)	(2,398)
Net share settlement for equity-based compensation	$ 0	(429)	0	0	0	(429)
Net share settlement for equity-based compensation (in shares)	(184,231)
BALANCE at Mar. 31, 2017	$ 141,377	28,486	(82,860)	(36,973)	(5,881)	44,149
BALANCE (in shares) at Mar. 31, 2017	30,498,388
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
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net loss	$ 0	0	0	(6,874)	0	$ (6,874)
Employee pension plan adjustments	0	0	0	0	162	162
Stock-based compensation expense
Restricted stock	$ 0	429	0	0	0	429
Restricted stock (in shares)	113,946
Net share settlement for equity-based compensation	$ 0	(311)	0	0	0	(311)
Net share settlement for equity-based compensation (in shares)	(168,254)
BALANCE at Mar. 31, 2018	$ 141,377	$ 29,452	$ (82,860)	$ (44,402)	$ (4,348)	$ 39,219
BALANCE (in shares) at Mar. 31, 2018	30,570,099					30,570,099