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INVESTMENT IN EQUITY SECURITIES (Details) - USD ($)
$ in Thousands, shares in Millions
3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Dec. 31, 2016
Dec. 31, 2017
Schedule of Available-for-sale Securities [Line Items]            
Number of investment shares acquired (in shares)         4.1  
Purchase of investment securities         $ 48,200  
Investment in equity securities $ 44,967   $ 44,967     $ 49,153
Unrealized gain (loss) on investment in equity securities 1,782 $ 0 (4,186) $ 0    
Unrealized gain (loss) on investment in equity securities, net of income taxes (OCI) 0 (5,530) 0 212    
Investment income, dividend $ 600 $ 600 $ 1,900 $ 1,900    
Investment shares, transfer restrictions, number of shares 1.0          
Minimum            
Schedule of Available-for-sale Securities [Line Items]            
Investment shares, transfer restrictions, percent 25.00%          
Maximum            
Schedule of Available-for-sale Securities [Line Items]            
Maximum allowable increase, percent 50.00%