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INVESTMENT IN EQUITY SECURITIES (Details) - USD ($)
$ in Thousands, shares in Millions
3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Dec. 31, 2016
Dec. 31, 2018
Marketable Securities [Line Items]            
Investment in equity securities $ 43,730   $ 43,730     $ 36,181
Unrealized gain (loss) from change in fair value 11,787 $ 1,533 14,025 $ (5,968)    
Unrealized gain (loss) from sale 1,200   1,500      
Investment income, dividend $ 500 $ 600 $ 1,200      
Maximum allowable increase, percent     50.00%      
Number of shares disposed (in shares) 0.6   0.6      
Proceeds received from sale of equity securities $ 6,500   $ 6,476 $ 0    
Maximum            
Marketable Securities [Line Items]            
Investment shares, transfer restrictions, percent (no more than)     25.00%      
RESI            
Marketable Securities [Line Items]            
Number of investment shares acquired (in shares)         4.1  
Number of securities outstanding (in shares) 3.6   3.6     4.1