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DEBT - Paragraph (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Apr. 18, 2017
Jun. 17, 2014
Jun. 30, 2017
Jun. 30, 2017
Apr. 17, 2017
Dec. 31, 2016
Sweep Arrangements            
DEBT            
Advances outstanding     $ 0 $ 0    
Interest Expense            
DEBT            
Amortization of Financing Costs and Discounts     5,500      
Former Credit Agreement            
DEBT            
Maximum borrowing capacity   $ 540,000        
Former Term Loan            
DEBT            
Maximum borrowing capacity   $ 415,000        
Amount outstanding         $ 278,300  
Term loan           $ 283,040
Former Term Loan | Base rate            
DEBT            
Percentage points added to the reference rate   2.00%        
Former Term Loan | LIBOR            
DEBT            
Percentage points added to the reference rate   3.00%        
Former Revolving Credit Facility            
DEBT            
Maximum borrowing capacity   $ 125,000        
Amount outstanding         $ 0  
Revolving credit facility            
DEBT            
Amount outstanding           $ 2,200
Availability for borrowings under line of credit     216,700 216,700    
Line of credit issued in the form of a standby letters of credit     $ 6,300 $ 6,300    
Letter of credit            
DEBT            
Maximum borrowing capacity   $ 50,000        
Revolving Credit Facility            
DEBT            
Maximum borrowing capacity $ 500,000          
Contractual term 5 years          
Accordion feature $ 200,000          
Effective interest rate (as a percent)     3.37% 3.37%    
Amount of debt hedged     $ 200,000 $ 200,000    
Debt instrument hedged (as a percent)     72.00% 72.00%    
Term loan     $ 277,000 $ 277,000    
Voting equity interest in foreign subsidiaries pledged as security (as a percent) 65.00%          
Non-voting equity interest in foreign subsidiaries pledged as security (as a percent) 100.00%          
Equity interest in domestic subsidiaries pledged as security (as a percent) 100.00%          
Minimum consolidated senior secured leverage ratio 3.00          
Maximum consolidated senior secured leverage ratio 3.50          
Revolving Credit Facility | Minimum            
DEBT            
Commitment fee (as a percent)       0.175%    
Revolving Credit Facility | Maximum            
DEBT            
Commitment fee (as a percent)       0.35%    
Revolving Credit Facility | Equal To Or Greater Than 3.25 to 1.00            
DEBT            
Minimum consolidated senior secured leverage ratio 3.25          
Revolving Credit Facility | Equal To Or Greater Than 2.50 to 1.00, But Less Than 3.25 to 1.00            
DEBT            
Minimum consolidated senior secured leverage ratio 2.50          
Maximum consolidated senior secured leverage ratio 3.25          
Revolving Credit Facility | Equal To Or Greater Than 1.75 to 1.00, But Less Than 2.50 to 1.00            
DEBT            
Minimum consolidated senior secured leverage ratio 1.75          
Maximum consolidated senior secured leverage ratio 2.50          
Revolving Credit Facility | Equal To Or Greater Than 1.00 to 1.00, But Less Than 1.75 to 1.00            
DEBT            
Minimum consolidated senior secured leverage ratio 1.00          
Maximum consolidated senior secured leverage ratio 1.75          
Revolving Credit Facility | Less Than 1.00 to 1.00            
DEBT            
Maximum consolidated senior secured leverage ratio 1.00          
Revolving Credit Facility | Base rate | Equal To Or Greater Than 3.25 to 1.00            
DEBT            
Percentage points added to the reference rate 1.00%          
Revolving Credit Facility | Base rate | Equal To Or Greater Than 2.50 to 1.00, But Less Than 3.25 to 1.00            
DEBT            
Percentage points added to the reference rate 0.75%          
Revolving Credit Facility | Base rate | Equal To Or Greater Than 1.75 to 1.00, But Less Than 2.50 to 1.00            
DEBT            
Percentage points added to the reference rate 0.50%          
Revolving Credit Facility | Base rate | Equal To Or Greater Than 1.00 to 1.00, But Less Than 1.75 to 1.00            
DEBT            
Percentage points added to the reference rate 0.25%          
Revolving Credit Facility | Base rate | Less Than 1.00 to 1.00            
DEBT            
Percentage points added to the reference rate 0.00%          
Revolving Credit Facility | LIBOR | Equal To Or Greater Than 3.25 to 1.00            
DEBT            
Percentage points added to the reference rate 2.00%          
Revolving Credit Facility | LIBOR | Equal To Or Greater Than 2.50 to 1.00, But Less Than 3.25 to 1.00            
DEBT            
Percentage points added to the reference rate 1.75%          
Revolving Credit Facility | LIBOR | Equal To Or Greater Than 1.75 to 1.00, But Less Than 2.50 to 1.00            
DEBT            
Percentage points added to the reference rate 1.50%          
Revolving Credit Facility | LIBOR | Equal To Or Greater Than 1.00 to 1.00, But Less Than 1.75 to 1.00            
DEBT            
Percentage points added to the reference rate 1.25%          
Revolving Credit Facility | LIBOR | Less Than 1.00 to 1.00            
DEBT            
Percentage points added to the reference rate 1.00%          
New Credit Agreement, Letter Of Credit            
DEBT            
Maximum borrowing capacity $ 75,000          
New Credit Agreement, Swingline Loans            
DEBT            
Maximum borrowing capacity $ 25,000          
New Credit Agreement, Swingline Loans | Sweep Arrangements            
DEBT            
Maximum borrowing capacity     $ 25,000 $ 25,000