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, 2017		Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016		Mar. 31, 2016		Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
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	$ (20,787)	[1]	$ 5,024	$ 3,120	$ 746	$ 3,377	$ 9,710	$ 22,776	[2]	$ (100,696)	[2]	$ (11,897)	$ (64,834)	$ 19,197
Undistributed (loss) earnings												(15,176)	(68,084)	15,962
Class A [Member]
Numerator [Abstract]
Net (loss) earnings												(2,113)	(11,408)	3,331
Less dividends declared												522	522	522
Undistributed (loss) earnings												$ (2,635)	$ (11,930)	$ 2,809
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)	$ (1.66)		$ 0.40	$ 0.24	$ 0.05	$ 0.27	$ 0.78	$ 1.83		$ (8.15)		$ (0.97)	$ (5.25)	$ 1.53
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												$ (9,784)	$ (53,426)	$ 15,866
Less dividends declared												2,757	2,728	2,713
Undistributed (loss) earnings												$ (12,541)	$ (56,154)	$ 13,153
Weighted average shares outstanding [Abstract]
Weighted average shares outstanding (in shares)												9,857	9,749	9,698
Net (loss) earnings per share [Abstract]
Common share - basic and diluted (in dollars per share)	$ (1.74)		$ 0.42	$ 0.26	$ 0.06	$ 0.29	$ 0.82	$ 1.93		$ (8.55)		$ (0.99)	$ (5.48)	$ 1.64

[1] The provision for income taxes in the fourth quarter of 2017 included an $18 million impact from the U.S. Tax Cuts and Jobs Act which was enacted on December 22, 2017. This consisted of an estimated transition tax on foreign earnings of approximately $16 million after the utilization of foreign tax credits and $2 million related to the revaluation of the Company's deferred tax assets.

[2] 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.