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LONG-TERM DEBT (Details) - USD ($)
$ in Thousands
6 Months Ended
Feb. 12, 2018
Jun. 30, 2018
Jun. 30, 2017
Long-term Debt [Abstract]      
Cash proceeds received   $ 499,295 $ 0
Senior Notes Due March 01, 2028 [Member]      
Long-term Debt [Abstract]      
Long term debt, face amount $ 500,000    
Debt instrument, interest rate, stated percentage 4.20%    
Credit facility, expiration date Mar. 01, 2028    
Periodic payment, interest $ 10,500    
Periodic payment, interest, exception of first payment $ 11,550    
Cash proceeds received   495,032  
Original issue discount   705  
Debt issuance costs   $ 4,263