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LONG-TERM DEBT - Refinancing of Credit Agreement and Term B Borrowings (Details) - USD ($)
$ in Thousands
6 Months Ended
Mar. 06, 2018
Jun. 30, 2018
Jun. 30, 2017
Dec. 31, 2017
Long-Term Debt        
Outstanding amount of debt   $ 524,624   $ 460,956
Debt issuance costs   6,487 $ 2,863  
Debt call premium   $ 8,436    
Credit Agreement        
Long-Term Debt        
Maximum borrowing capacity $ 605,000      
Interest rate in excess of applicable rate upon acceleration and default ( as a percent) 2.00%      
Credit Agreement | One-month LIBOR        
Long-Term Debt        
Interest rate margin (as a percent) 1.00%      
Credit Agreement | Federal funds rate        
Long-Term Debt        
Interest rate margin (as a percent) 0.50%      
Credit Agreement | Fiscal quarters ended June 30, 2018, September 30, 2018, December 31, 2018 and March 31, 2019        
Long-Term Debt        
Consolidated leverage ratio 5.00%      
Credit Agreement | Fiscal quarters ended June 30, 2019 through March 31, 2020        
Long-Term Debt        
Consolidated leverage ratio 4.75%      
Credit Agreement | Fiscal quarters ended June 30, 2020 through March 31, 2021        
Long-Term Debt        
Consolidated leverage ratio 4.50%      
Credit Agreement | Fiscal quarters ended June 30, 2021 through March 31, 2022        
Long-Term Debt        
Consolidated leverage ratio 4.25%      
Credit Agreement | Fiscal quarters ended June 30, 2022 and the last day of each fiscal quarter thereafter        
Long-Term Debt        
Consolidated leverage ratio 3.75%      
Credit Agreement | Last day of any fiscal quarter        
Long-Term Debt        
Consolidated leverage ratio 2.75%      
Credit Agreement | Term Loan        
Long-Term Debt        
Outstanding amount of debt $ 505,000      
Credit Agreement | Revolving Credit Facility        
Long-Term Debt        
Maximum borrowing capacity 100,000      
Letters of credit outstanding amount 5,900      
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%      
Credit Agreement | Revolving Credit Facility | Minimum        
Long-Term Debt        
Unused commitment fee (as a percent) 0.375%      
Credit Agreement | Revolving Credit Facility | Maximum        
Long-Term Debt        
Unused commitment fee (as a percent) 0.50%      
Credit Agreement | Term Loan B        
Long-Term Debt        
Weighted average interest rate   5.40%    
Credit Agreement, dated March 6, 2018        
Long-Term Debt        
Proceeds from borrowing $ 501,500      
Debt issuance costs 6,800      
Credit Agreement, dated March 6, 2018 | Term Loan B        
Long-Term Debt        
Outstanding amount of debt   $ 503,738    
Prior Credit Agreement, dated August 1, 2016        
Long-Term Debt        
Debt call premium 8,400      
Unamortized discount and debt issuance costs expensed $ 8,600      
Prior Credit Agreement, dated August 1, 2016 | Term Loan B        
Long-Term Debt        
Outstanding amount of debt       280,000
Prior Credit Agreement, dated June 17, 2013 | Term Loan        
Long-Term Debt        
Outstanding amount of debt       151,875
Prior Credit Agreement, dated June 17, 2013 | Revolving Credit Facility        
Long-Term Debt        
Outstanding amount of debt       $ 5,000