DESCRIPTION OF BUSINESS AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES, Earnings Per Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ 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	[2]	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]
Anti-dilutive securities excluded from earnings per share calculation (in shares)												0	0	0
Numerator [Abstract]
Net (loss) earnings	$ 3,377	$ 9,710	$ 22,776	[1]	$ (100,696)	[1]	$ 2,895	$ 4,920	$ 6,062	$ 5,320		$ (64,834)	$ 19,197	$ 8,603
Undistributed (loss) earnings												(68,084)	15,962	5,416
Class A [Member]
Numerator [Abstract]
Net (loss) earnings												(11,408)	3,331	1,492
Less dividends declared												522	522	522
Undistributed (loss) earnings												$ (11,930)	$ 2,809	$ 970
Weighted average shares outstanding [Abstract]
Weighted average shares outstanding (in shares)												2,175	2,175	2,175
Net (loss) earnings per share [Abstract]
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		$ (5.25)	$ 1.53	$ 0.69
Class B [Member]
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]
Dividend rate Class B common stock in excess of dividend rate of Class A common stock												5.00%	5.00%	5.00%
Undistributed earning allocation rate of Class B common stock in excess of Class A common stock, percentage												5.00%	5.00%	5.00%
Numerator [Abstract]
Net (loss) earnings												$ (53,426)	$ 15,866	$ 7,111
Less dividends declared												2,728	2,713	2,665
Undistributed (loss) earnings												$ (56,154)	$ 13,153	$ 4,446
Weighted average shares outstanding [Abstract]
Weighted average shares outstanding (in shares)												9,749	9,698	9,491
Net (loss) earnings per share [Abstract]
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		$ (5.48)	$ 1.64	$ 0.75

[1] 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.

[2] 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.