SELECTED QUARTERLY DATA (UNAUDITED) (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended											12 Months Ended
	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016		Mar. 31, 2016		Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015		Dec. 31, 2016	Dec. 31, 2015		Dec. 31, 2014
Selected quarterly financial data [Abstract]
Net sales	$ 118,539	$ 128,809	$ 131,622		$ 121,182		$ 135,246	$ 144,161	$ 145,658	$ 142,015	[1]	$ 500,153	$ 567,080	[2]	$ 487,076	[2]
Gross profit	24,579	26,575	25,692		23,074		26,043	27,412	28,560	26,813	[1]	99,908	108,827		87,355
Net (loss) earnings	$ 3,377	$ 9,710	22,776	[3]	(100,696)	[3]	$ 2,895	$ 4,920	$ 6,062	5,320	[1]	(64,834)	19,197		8,603
Net (loss) earnings per share:
Provisional non-cash impairment charges					$ 104,300							106,000
Reversal of provisional non-cash impairment charges			$ (2,600)
Measurement Period Adjustment [Member]
Selected quarterly financial data [Abstract]
Gross profit										27,100
Net (loss) earnings										$ 5,600
Class A Common Stock [Member]
Selected quarterly financial data [Abstract]
Net (loss) earnings												$ (11,408)	$ 3,331		$ 1,492
Net (loss) earnings per share:
Common share - basic and diluted (in dollars per share)	$ 0.27	$ 0.78	$ 1.83		$ (8.15)		$ 0.23	$ 0.39	$ 0.49	$ 0.43	[1]	$ (5.25)	$ 1.53		$ 0.69
Class A Common Stock [Member] | Measurement Period Adjustment [Member]
Net (loss) earnings per share:
Common share - basic and diluted (in dollars per share)										0.45
Class B Common Stock [Member]
Selected quarterly financial data [Abstract]
Net (loss) earnings												$ (53,426)	$ 15,866		$ 7,111
Net (loss) earnings per share:
Common share - basic and diluted (in dollars per share)	$ 0.29	$ 0.82	$ 1.93		$ (8.55)		$ 0.25	$ 0.42	$ 0.52	0.45	[1]	$ (5.48)	$ 1.64		$ 0.75
Class B Common Stock [Member] | Measurement Period Adjustment [Member]
Net (loss) earnings per share:
Common share - basic and diluted (in dollars per share)										$ 0.48

[1] Revised from 10-Q disclosures to reflect immaterial measurement period adjustments related to the 2014 Acquisitions. First quarter 10-Q reflected gross profit of $27.1 million, net earnings of $5.6 million, earnings per Class A common share of $0.45 per share and earnings per Class B common share of $0.48 per share.

[2] (Revised)

[3] In connection with an interim impairment test related to the Company's goodwill and other intangible assets, provisional non-cash impairment charges totaling $104.3 million were recorded during the first quarter of 2016. During the second quarter of 2016, the Company finalized its interim impairment test, which resulted in a $2.6 million reduction to the provisional impairment charge recorded during the first quarter.