CONDENSED CONSOLIDATED STATEMENTS OF CHANGES IN STOCKHOLDERS' EQUITY (Unaudited) - USD ($) $ in Thousands	Common Stock [Member]	Additional Paid-in Capital [Member]	Treasury Stock [Member]	Accumulated Deficit [Member]	Accumulated Other Comprehensive Loss [Member]	Total
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
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
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
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net loss						(10,978)
BALANCE at Jun. 30, 2018	$ 141,377	29,444	(82,860)	(48,506)	(4,187)	35,268
BALANCE (in shares) at Jun. 30, 2018	30,552,333
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
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net loss	$ 0	0	0	(4,104)	0	(4,104)
Employee pension plan adjustments	0	0	0	0	161	161
Stock-based compensation expense
Restricted stock	$ 0	53	0	0	0	53
Restricted stock (in shares)	21,622
Net share settlement for equity-based compensation	$ 0	(61)	0	0	0	(61)
Net share settlement for equity-based compensation (in shares)	(39,388)
BALANCE at Jun. 30, 2018	$ 141,377	29,444	(82,860)	(48,506)	(4,187)	35,268
BALANCE (in shares) at Jun. 30, 2018	30,552,333
BALANCE at Dec. 31, 2018	$ 141,377	29,484	(82,860)	(44,073)	(4,062)	$ 39,866
BALANCE (in shares) at Dec. 31, 2018	30,552,333					30,552,333
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net loss	$ 0	0	0	(5,467)	0	$ (5,467)
Employee pension plan adjustments	0	0	0	0	154	154
Stock-based compensation expense
Restricted stock	$ 0	52	0	0	0	52
Restricted stock (in shares)	478,853
Net share settlement for equity-based compensation	$ 0	(18)	0	0	0	(18)
Net share settlement for equity-based compensation (in shares)	(5,518)
BALANCE at Mar. 31, 2019	$ 141,377	29,518	(82,860)	(49,540)	(3,908)	34,587
BALANCE (in shares) at Mar. 31, 2019	31,025,668
BALANCE at Dec. 31, 2018	$ 141,377	29,484	(82,860)	(44,073)	(4,062)	$ 39,866
BALANCE (in shares) at Dec. 31, 2018	30,552,333					30,552,333
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net loss						$ (8,531)
BALANCE at Jun. 30, 2019	$ 141,377	29,709	(82,860)	(52,604)	(3,754)	$ 31,868
BALANCE (in shares) at Jun. 30, 2019	31,142,251					31,142,251
BALANCE at Mar. 31, 2019	$ 141,377	29,518	(82,860)	(49,540)	(3,908)	$ 34,587
BALANCE (in shares) at Mar. 31, 2019	31,025,668
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net loss	$ 0	0	0	(3,064)	0	(3,064)
Employee pension plan adjustments	0	0	0	0	154	154
Stock-based compensation expense
Restricted stock	$ 0	191	0	0	0	191
Restricted stock (in shares)	116,583
Net share settlement for equity-based compensation	$ 0	0	0	0	0	0
Net share settlement for equity-based compensation (in shares)	0
BALANCE at Jun. 30, 2019	$ 141,377	$ 29,709	$ (82,860)	$ (52,604)	$ (3,754)	$ 31,868
BALANCE (in shares) at Jun. 30, 2019	31,142,251					31,142,251