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INVESTMENT IN EQUITY SECURITIES (Details) - USD ($)
$ in Thousands, shares in Millions
3 Months Ended 12 Months Ended
Dec. 31, 2018
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Marketable Securities [Line Items]              
Number of available for sale shares acquired (in shares)             4.1
Payments to acquire equity securities         $ 0 $ 0 $ 48,219
Investment in equity securities $ 36,181       36,181 49,153  
Unrealized loss on investment in equity securities $ 8,800 $ (1,800) $ (1,500) $ 7,500 12,972 0 0
Unrealized gain (loss) on investment in equity securities, net of income tax (provision) benefit of $0, $(921), $720         0 2,478 (1,745)
Investment income, dividend         2,500 $ 2,500 $ 2,300
Available for sale securities, investment related expenses         $ 3,400    
Investment shares, transfer restrictions, number of shares (in shares)         1.0    
Maximum allowable increase, percent         50.00%    
Maximum              
Marketable Securities [Line Items]              
Investment shares, transfer restrictions, percent (no more than)         25.00%