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STOCKHOLDERS' EQUITY (Details) | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2014 $ / shares | Dec. 31, 2015 USD ($) Vote | Dec. 31, 2014 USD ($) | Dec. 31, 2013 USD ($)
Common Stock [Member] |  |  |  |
Class of Stock [Line Items] |  |  |  |
Common stock dividend paid in cash (in dollars per share) | $ / shares | $ 1.00 |  |  |
Aggregate dividends paid on common Stock | $ |  | $ 7,358,000 | $ 27,077,000 | $ 4,787,000
Class A Common Stock [Member] |  |  |  |
Class of Stock [Line Items] |  |  |  |
Preferential dividend rate of common stock of dividends paid on Class A common stock |  | 105.00% |  |
Percentage of number of directors elected under Class A common stock voting right |  | 75.00% |  |
Number of votes per share | Vote |  | 10 |  |
Conversion basis |  | 1-for-1 basis |  |
Common stock dividend paid in cash (in dollars per share) | $ / shares | $ 0.95 |  |  |
Aggregate dividends paid on common Stock | $ |  | $ 702,000 | $ 2,703,000 | $ 566,000

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