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REVOLVING LOAN (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Jun. 27, 2018
May 07, 2014
Loan agreement [Abstract]            
Capitalized costs net of accumulated amortization $ 1,369 $ 766 $ 1,369 $ 766    
Write off of deferred financing costs 363          
Amortization expense pertaining to capitalized costs $ 431 $ 120 $ 540 $ 244    
Credit Agreement [Member]            
Loan agreement [Abstract]            
Period for senior secured credit agreement     5 years      
Maximum borrowing capacity         $ 500,000  
Maturity date     Jun. 27, 2023      
Interest rate on credit agreement 3.228%   3.228%      
Commitment fee percentage     0.175%      
Unused portion of revolving loan $ 289,250   $ 289,250      
Credit Agreement [Member] | Minimum [Member]            
Loan agreement [Abstract]            
Commitment fee percentage     0.15%      
Credit Agreement [Member] | Maximum [Member]            
Loan agreement [Abstract]            
Commitment fee percentage     0.275%      
Term Loan A [Member]            
Loan agreement [Abstract]            
Maximum borrowing capacity           $ 350,000
Payment for outstanding balance     $ 210,750      
Revolving Credit Facility [Member]            
Loan agreement [Abstract]            
Maximum borrowing capacity           $ 100,000