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DEBT AND CREDIT AGREEMENTS (Credit Agreement) (Details) - Line of Credit - USD ($)
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Feb. 12, 2020
Jan. 31, 2020
Term Loan        
Debt Instrument [Line Items]        
Line of credit facility borrowing capacity $ 225,000,000      
Borrowed 165,000,000      
Available $ 60,000,000      
Weighted Average Interest Rate (in percentage) 4.75%      
Term Loan | Subsequent Event        
Debt Instrument [Line Items]        
Available     $ 0  
Term Loan | LIBOR        
Debt Instrument [Line Items]        
Basis of variable spread (in percentage) 0.55%      
Term Loan | Base Rate        
Debt Instrument [Line Items]        
Basis of variable spread (in percentage) 0.00%      
Revolver        
Debt Instrument [Line Items]        
Line of credit facility borrowing capacity $ 250,000,000 $ 250,000,000    
Borrowed 0 0    
Available $ 250,000,000 $ 250,000,000    
Weighted Average Interest Rate (in percentage) 0.00% 0.00%    
Revolver | Subsequent Event        
Debt Instrument [Line Items]        
Available     $ 173,000,000  
Revolver | LIBOR        
Debt Instrument [Line Items]        
Basis of variable spread (in percentage) 1.00% 1.00%    
Revolver | Base Rate        
Debt Instrument [Line Items]        
Basis of variable spread (in percentage) 0.00% 0.00%    
Sub-Limit LOC        
Debt Instrument [Line Items]        
Line of credit facility borrowing capacity $ 50,000,000 $ 50,000,000    
Sub-Limit LOC | Subsequent Event        
Debt Instrument [Line Items]        
Borrowed       $ 12,000,000