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NET EARNINGS (LOSS) PER SHARE (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2016 | Sep. 30, 2015 | Sep. 30, 2016 | Sep. 30, 2015
Numerator [Abstract] |  |  |  |
Net earnings (loss) | $ 9,710 | $ 4,920 | $ (68,211) | $ 16,302
Less dividends declared: [Abstract] |  |  |  |
Undistributed earnings (loss) | 8,896 | 4,109 | (70,647) | 13,870
Undistributed earnings (loss) allocation - basic and diluted [Abstract] |  |  |  |
Total undistributed earnings (loss) | 8,896 | 4,109 | (70,647) | 13,870
Net earnings (loss) allocation - basic and diluted [Abstract] |  |  |  |
Net earnings (loss) | 9,710 | 4,920 | (68,211) | 16,302
Class A Common Shares [Member] |  |  |  |
Numerator [Abstract] |  |  |  |
Net earnings (loss) | 1,688 | 852 | (12,008) | 2,833
Less dividends declared: [Abstract] |  |  |  |
Dividends declared | 131 | 130 | 392 | 391
Undistributed earnings (loss) allocation - basic and diluted [Abstract] |  |  |  |
Total undistributed earnings (loss) | 1,557 | 722 | (12,400) | 2,442
Net earnings (loss) allocation - basic and diluted [Abstract] |  |  |  |
Net earnings (loss) | $ 1,688 | $ 852 | $ (12,008) | $ 2,833
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) | $ 0.78 | $ 0.39 | $ (5.52) | $ 1.30
Class B Common Shares [Member] |  |  |  |
Numerator [Abstract] |  |  |  |
Net earnings (loss) | $ 8,022 | $ 4,068 | $ (56,203) | $ 13,469
Less dividends declared: [Abstract] |  |  |  |
Dividends declared | 683 | 681 | 2,044 | 2,041
Undistributed earnings (loss) allocation - basic and diluted [Abstract] |  |  |  |
Total undistributed earnings (loss) | 7,339 | 3,387 | (58,247) | 11,428
Net earnings (loss) allocation - basic and diluted [Abstract] |  |  |  |
Net earnings (loss) | $ 8,022 | $ 4,068 | $ (56,203) | $ 13,469
Weighted-average shares outstanding [Abstract] |  |  |  |
Common share - basic and diluted (in shares) | 9,760 | 9,719 | 9,730 | 9,694
Net earnings (loss) per share [Abstract] |  |  |  |
Common share - basic and diluted (in dollars per share) | $ 0.82 | $ 0.42 | $ (5.78) | $ 1.39

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