Consolidated Statements of Operations - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Income Statement [Abstract]
Sales	$ 261,644	$ 308,133	$ 390,011
Cost of sales	208,694	242,223	304,073
Gross profit	52,950	65,910	85,938
Operating expenses:
Salaries and commissions	29,369	28,537	31,196
Other operating expenses	24,714	25,023	26,400
Depreciation and amortization	3,018	2,915	2,919
Impairment charge	2,384	3,417
Total operating expenses	59,485	59,892	60,515
Operating income (loss)	(6,535)	6,018	25,423
Interest expense	845	901	1,168
Income (loss) before income taxes	(7,380)	5,117	24,255
Income tax expense (benefit)	(1,374)	3,073	9,283
Net income (loss)	$ (6,006)	$ 2,044	$ 14,972
Earnings (loss) per share:
Basic (in dollars per share)	$ (0.37)	$ 0.12	$ 0.85
Diluted (in dollars per share)	$ (0.37)	$ 0.12	$ 0.85
Weighted average common shares outstanding:
Basic (in shares)	16,345,679	17,012,560	17,605,290
Diluted (in shares)	16,345,679	17,067,593	17,683,931
Dividend declared per share (in dollars per share)	$ 0.15	$ 0.42	$ 0.47