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DEBT AND OTHER OBLIGATIONS - Refinancing of Credit Agreement and Term B Borrowings (Details) - USD ($)
$ in Thousands
Mar. 06, 2018
Mar. 31, 2019
Dec. 31, 2018
DEBT AND OTHER OBLIGATIONS      
Outstanding amount of debt   $ 508,564 $ 520,080
Letters of credit outstanding amount $ 5,200    
Credit Agreement, dated March 6, 2018, Term Loan B      
DEBT AND OTHER OBLIGATIONS      
Outstanding amount of debt 505,000    
Weighted average interest rate   6.00%  
Revolving Credit Facility      
DEBT AND OTHER OBLIGATIONS      
Maximum borrowing capacity 605,000    
Increase in additional borrowing capacity $ 125,000    
Maximum leverage ratio to use maximum credit facility 3.80    
Increase in margin(as a percent) 50.00%    
Interest rate in excess of applicable rate upon acceleration and default ( as a percent) 2.00%    
Revolving Credit Facility | Minimum      
DEBT AND OTHER OBLIGATIONS      
Unused commitment fee (as a percent) 0.375%    
Revolving Credit Facility | Maximum      
DEBT AND OTHER OBLIGATIONS      
Unused commitment fee (as a percent) 0.50%    
Revolving Credit Facility | LIBOR      
DEBT AND OTHER OBLIGATIONS      
Interest rate margin (as a percent) 1.00%    
Revolving Credit Facility | Federal funds rate      
DEBT AND OTHER OBLIGATIONS      
Interest rate margin (as a percent) 0.50%    
Revolving Credit Facility | Fiscal quarter ended March 31, 2019      
DEBT AND OTHER OBLIGATIONS      
Consolidated leverage ratio 5.00%    
Revolving Credit Facility | Fiscal quarters ended June 30, 2019 through March 31, 2020      
DEBT AND OTHER OBLIGATIONS      
Consolidated leverage ratio 4.75%    
Revolving Credit Facility | Fiscal quarters ended June 30, 2020 through March 31, 2021      
DEBT AND OTHER OBLIGATIONS      
Consolidated leverage ratio 4.50%    
Revolving Credit Facility | Fiscal quarters ended June 30, 2021 through March 31, 2022      
DEBT AND OTHER OBLIGATIONS      
Consolidated leverage ratio 4.25%    
Revolving Credit Facility | Fiscal quarters ended June 30, 2022 and the last day of each fiscal quarter thereafter      
DEBT AND OTHER OBLIGATIONS      
Consolidated leverage ratio 3.75%    
Revolving Credit Facility | Last day of any fiscal quarter      
DEBT AND OTHER OBLIGATIONS      
Consolidated leverage ratio 2.75%    
Revolving Credit Facility | Revolving Credit Facility      
DEBT AND OTHER OBLIGATIONS      
Maximum borrowing capacity $ 100,000