CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS (Unaudited) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Net sales	$ 113,668	$ 121,182
Cost of sales	90,390	98,108
Gross profit	23,278	23,074
Selling, general and administrative expense	21,152	17,670
Impairment of goodwill and other intangible assets	0	108,583
Restructuring charges	33	228
Income (loss) from operations	2,093	(103,407)
Interest expense	(1,424)	(2,201)
Interest income and other, net	54	40
Earnings (loss) before provision (benefit) for income taxes	723	(105,568)
Benefit form income taxes	(23)	(4,872)
Net earnings (loss) available to common shareholders	746	(100,696)
Class A Common Share [Member]
Net earnings (loss) available to common shareholders	$ 116	$ (17,729)
Net earnings (loss) per common share:
Common share - basic and diluted (in dollars per share)	$ 0.05	$ (8.15)
Weighted-average number of shares outstanding:
Common share - basic and diluted (in shares)	2,175	2,175
Dividends paid per common share:
Common share (in dollars per share)	$ 0.06	$ 0.06
Class B Common Share [Member]
Net earnings (loss) available to common shareholders	$ 630	$ (82,967)
Net earnings (loss) per common share:
Common share - basic and diluted (in dollars per share)	$ 0.06	$ (8.55)
Weighted-average number of shares outstanding:
Common share - basic and diluted (in shares)	9,845	9,701
Dividends paid per common share:
Common share (in dollars per share)	$ 0.07	$ 0.07