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NONCONTROLLING INTEREST (NONCONTROLLING INTEREST ROLLFORWARD TABLE) (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Stockholders' Equity Attributable to Noncontrolling Interest    
Noncontrolling interest, January 1 $ 7,677  
Dividends distributed to noncontrolling interest (900) $ (945)
Equity contribution (1,330)  
Noncontrolling interest, March 31 9,610  
Percepta LLC    
Stockholders' Equity Attributable to Noncontrolling Interest    
Noncontrolling interest, January 1 7,677 6,978
Net income attributable to noncontrolling interest 1,474 1,341
Dividends distributed to noncontrolling interest (900) (945)
Equity contribution 1,330  
Foreign currency translation adjustments 29 101
Noncontrolling interest, March 31 $ 9,610 $ 7,475