Consolidated Statements of Stockholders' Equity - USD ($) $ in Thousands		Common Stock [Member]	Additional Paid-in Capital [Member]	Retained Earnings [Member]	AOCI Attributable to Parent [Member]	Total
Balances (in shares) at Dec. 31, 2015		9,564,752
Beginning balance at Dec. 31, 2015		$ 96	$ 117,819	$ 101,183	$ (1,538)	$ 217,560
Net income (loss)				(9,263)		(9,263)
Pension liability adjustment, net of tax expense/benefit					131	131
Unrealized gain (loss) on cash flow hedges, net of tax expense/benefit					(76)	(76)
Issuance of common stock under stock compensation plans (in shares)		36,259
Issuance of common stock under stock compensation plans			(31)			(31)
Tax deficiency from stock compensation plans			(909)			(909)
Share-based compensation expense			1,801			1,801
Balances (in shares) at Dec. 31, 2016		9,601,011
Ending balance at Dec. 31, 2016		$ 96	118,680	91,920	(1,483)	209,213
Net income (loss)				(10,163)		(10,163)
Pension liability adjustment, net of tax expense/benefit					57	57
Unrealized gain (loss) on cash flow hedges, net of tax expense/benefit					(19)	(19)
Issuance of common stock under stock compensation plans (in shares)		18,744
Issuance of common stock under stock compensation plans			(24)			(24)
Share-based compensation expense			1,200			1,200
Balances (in shares) at Dec. 31, 2017		9,619,755
Ending balance at Dec. 31, 2017		$ 96	119,856	81,757	(1,445)	200,264
Cumulative-effect adjustment (Note 2)				(875)		(875)
Balances (in shares) at Jan. 01, 2018		9,619,755
Ending balance at Jan. 01, 2018		$ 96	119,856	80,882	(1,445)	199,389
Balances (in shares) at Dec. 31, 2017		9,619,755
Beginning balance at Dec. 31, 2017		$ 96	119,856	81,757	(1,445)	200,264
Net income (loss)	[1]					20,312
Balances (in shares) at Dec. 31, 2018		9,735,055
Ending balance at Dec. 31, 2018		$ 97	118,835	101,194	(1,536)	218,590
Balances (in shares) at Jan. 01, 2018		9,619,755
Beginning balance at Jan. 01, 2018		$ 96	119,856	80,882	(1,445)	199,389
Net income (loss)				20,312		20,312
Pension liability adjustment, net of tax expense/benefit					(115)	(115)
Unrealized gain (loss) on cash flow hedges, net of tax expense/benefit					24	24
Issuance of common stock under stock compensation plans (in shares)		115,300
Issuance of common stock under stock compensation plans		$ 1	(1,302)			(1,301)
Share-based compensation expense			281			281
Balances (in shares) at Dec. 31, 2018		9,735,055
Ending balance at Dec. 31, 2018		$ 97	$ 118,835	$ 101,194	$ (1,536)	$ 218,590

[1] Net income for the third quarter of 2018 includes a preliminary bargain purchase gain of $21.9 million. Net income for the fourth quarter of 2018 includes a measurement period adjustment of $1.8 million to decrease the bargain purchase gain.