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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)

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