EARNINGS (LOSS) PER SHARE (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Numerator [Abstract]
Net earnings (loss)	$ 22,776	$ 6,062	$ (77,921)	$ 11,382	[1]
Less dividends declared: [Abstract]
Undistributed earnings (loss)	21,967	5,250	(79,542)	9,761
Undistributed earnings (loss) allocation - basic and diluted [Abstract]
Total undistributed earnings (loss)	21,967	5,250	(79,542)	9,761
Net earnings (loss) allocation - basic and diluted [Abstract]
Net earnings (loss)	22,776	6,062	(77,921)	11,382	[1]
Class A [Member]
Numerator [Abstract]
Net earnings (loss)	3,987	1,054	(13,718)	1,981
Less dividends declared: [Abstract]
Dividends declared	131	130	261	261
Undistributed earnings (loss) allocation - basic and diluted [Abstract]
Total undistributed earnings (loss)	3,856	924	(13,979)	1,720
Net earnings (loss) allocation - basic and diluted [Abstract]
Net earnings (loss)	$ 3,987	$ 1,054	$ (13,718)	$ 1,981
Weighted-average shares outstanding [Abstract]
Common share - basic and diluted (in shares)	2,175	2,175	2,175	2,175
Net earnings (loss) per share [Abstract]
Common share - basic and diluted (in dollars per share)	$ 1.83	$ 0.49	$ (6.31)	$ 0.91
Class B [Member]
Numerator [Abstract]
Net earnings (loss)	$ 18,789	$ 5,008	$ (64,203)	$ 9,401
Less dividends declared: [Abstract]
Dividends declared	678	682	1,360	1,360
Undistributed earnings (loss) allocation - basic and diluted [Abstract]
Total undistributed earnings (loss)	18,111	4,326	(65,563)	8,041
Net earnings (loss) allocation - basic and diluted [Abstract]
Net earnings (loss)	$ 18,789	$ 5,008	$ (64,203)	$ 9,401
Weighted-average shares outstanding [Abstract]
Common share - basic and diluted (in shares)	9,729	9,693	9,715	9,682
Net earnings (loss) per share [Abstract]
Common share - basic and diluted (in dollars per share)	$ 1.93	$ 0.52	$ (6.61)	$ 0.97

[1] (Revised)