EARNINGS (LOSS) PER SHARE (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Numerator [Abstract]
Net earnings (loss)	$ 746	$ (100,696)
Undistributed loss	(83)	(101,509)
Class A [Member]
Numerator [Abstract]
Net earnings (loss)	116	(17,729)
Less dividends declared	130	131
Undistributed loss	$ (14)	$ (17,860)
Weighted-average shares outstanding [Abstract]
Basic and diluted (in shares)	2,175	2,175
Net earnings (loss) per share [Abstract]
Basic and diluted (in dollars per share)	$ 0.05	$ (8.15)
Class B [Member]
Numerator [Abstract]
Net earnings (loss)	$ 630	$ (82,967)
Less dividends declared	699	682
Undistributed loss	$ (69)	$ (83,649)
Weighted-average shares outstanding [Abstract]
Basic and diluted (in shares)	9,845	9,701
Net earnings (loss) per share [Abstract]
Basic and diluted (in dollars per share)	$ 0.06	$ (8.55)