Consolidated Statements of Income - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Income Statement [Abstract]
Sales	$ 308,133	$ 390,011	$ 383,292
Cost of sales	242,223	304,073	298,633
Gross profit	65,910	85,938	84,659
Operating expenses:
Salaries and commissions	28,537	31,196	30,946
Other operating expenses	25,023	26,400	26,068
Depreciation and amortization	2,915	$ 2,919	2,978
Impairment charge	3,417		7,562
Total operating expenses	59,892	$ 60,515	67,554
Operating income	6,018	25,423	17,105
Interest expense	901	1,168	992
Income before income taxes	5,117	24,255	16,113
Income tax provision	3,073	9,283	8,211
Net income	$ 2,044	$ 14,972	$ 7,902
Earnings per share:
Basic (in dollars per share)	$ 0.12	$ 0.85	$ 0.44
Diluted (in dollars per share)	$ 0.12	$ 0.85	$ 0.44
Weighted average common shares outstanding:
Basic (in shares)	17,012,560	17,605,290	17,805,464
Diluted (in shares)	17,067,593	17,683,931	17,900,372
Dividends declared per share (in dollars per share)	$ 0.42	$ 0.47	$ 0.42