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DEBT, CREDIT FACILITY, AND CAPITAL LEASE OBLIGATIONS (Credit Facility) (Details) - USD ($)
9 Months Ended
Sep. 30, 2018
Nov. 01, 2018
Line of Credit | Revolving Credit Facility And Letter of Credit    
Debt Instrument [Line Items]    
Capacity $ 250,000,000  
Borrowed 15,000,000  
Available $ 235,000,000  
Interest Rate (percentage) 3.24%  
Line of Credit | Letter of Credit    
Debt Instrument [Line Items]    
Capacity $ 50,000,000  
LIBOR    
Debt Instrument [Line Items]    
Variable rate (percentage) 1.00%  
Base Rate    
Debt Instrument [Line Items]    
Variable rate (percentage) 0.00%  
Subsequent Event | Line of Credit | Revolving Credit Facility And Letter of Credit    
Debt Instrument [Line Items]    
Capacity   $ 205,000,000