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, 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	(9,677)	0	(9,677)
Employee pension plan adjustments	0	0	0	0	666	666
Stock-based compensation expense
Restricted stock	$ 0	1,086	0	0	0	1,086
Restricted stock (in shares)	1,079,267
Net share settlement for equity-based compensation	$ 0	(107)	0	0	0	(107)
Net share settlement for equity-based compensation (in shares)	(38,389)
BALANCE at Sep. 30, 2016	$ 141,377	28,271	(82,860)	(7,417)	(6,406)	72,965
BALANCE (in shares) at Sep. 30, 2016	30,768,433
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	(19,190)	0	$ (19,190)
Employee pension plan adjustments	0	0	0	0	881	881
Stock-based compensation expense
Restricted stock	$ 0	948	0	0	0	948
Restricted stock (in shares)	128,810
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 Sep. 30, 2017	$ 141,377	$ 29,073	$ (82,860)	$ (45,234)	$ (5,220)	$ 37,136
BALANCE (in shares) at Sep. 30, 2017	30,629,596					30,629,596