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FAIR VALUE OF FINANCIAL INSTRUMENTS - Carrying Value (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended 12 Months Ended
Jun. 30, 2019
Sep. 30, 2019
Dec. 31, 2018
Dec. 31, 2017
Investments All Other Investments Abstract        
Investment balance before cumulative impairent as of January1     $ 11,205 $ 9,955
Accumulated impairment as of January 1,   $ 0 0  
Investment beginning balance after cumulative impairment as of January 1     11,205 $ 9,955
Acquisition of interest in a privately held company $ 1,500 1,500 1,250  
Ending period balance   12,705 11,205  
Term Loan B [Member]        
Fair Value Of Instruments [Line Items]        
Carrying value of debt   866,700 1,291,700  
Fair value of debt   867,783 1,243,261  
Revolver [Member]        
Fair Value Of Instruments [Line Items]        
Carrying value of debt   134,000 180,000  
Fair value of debt   134,000 180,000  
Senior Notes        
Fair Value Of Instruments [Line Items]        
Carrying value of debt   400,000 400,000  
Fair value of debt   415,500 378,000  
Notes [Member]        
Fair Value Of Instruments [Line Items]        
Carrying value of debt   325,000 0  
Fair value of debt   338,406 0  
Other Debt [Member]        
Fair Value Of Instruments [Line Items]        
Carrying value of debt   881 912  
Letter of credit        
Fair Value Of Instruments [Line Items]        
Carrying value of debt   $ 5,862 $ 5,862