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STOCKHOLDERS' EQUITY (Details)
$ / shares in Units, $ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2016
$ / shares
Dec. 31, 2017
USD ($)
Vote
$ / shares
Dec. 31, 2016
USD ($)
$ / shares
Dec. 31, 2015
USD ($)
$ / shares
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 | $   $ 10,473 $ 27,674 $ 7,358
Class A Common Stock [Member]        
Class of Stock [Line Items]        
Preferential dividend rate of common stock of dividends paid   105.00%    
Percentage of number of directors elected under 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 $ 0.51 $ 1.365 $ 0.34
Aggregate dividends paid on common Stock | $   $ 919 $ 2,735 $ 702