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LONG-TERM DEBT Revolving Credit Facility Narrative (Details) - USD ($)
9 Months Ended
Jul. 13, 2018
Sep. 30, 2018
Dec. 31, 2017
Revolving Credit Facility [Line Items]      
Total   $ 107,900,000 $ 118,756,000
Bank of America, N.A. and Wells Fargo Capital Finance, LLC      
Revolving Credit Facility [Line Items]      
Total   107,900,000 $ 95,900,000
Revolving credit facility, interest rate description one-month    
Bank of America, N.A. and Wells Fargo Capital Finance, LLC | Revolving Credit Facility      
Revolving Credit Facility [Line Items]      
Revolving Credit Facility, maximum borrowing capacity $ 300,000,000    
Revolving Credit Facility, maximum borrowing capacity, subject to lender approval $ 450,000,000    
Total   107,900,000  
Letters of Credit Outstanding, Amount   $ 6,900,000  
London Interbank Offered Rate (LIBOR) | Bank of America, N.A. and Wells Fargo Capital Finance, LLC | Revolving Credit Facility      
Revolving Credit Facility [Line Items]      
Debt Instrument, basis spread on variable rate   1.25%  
Revolving credit facility, additional base rate 1.00% 2.15%  
Line of Credit Facility, Interest Rate at Period End   3.40%  
London Interbank Offered Rate (LIBOR) | Bank of America, N.A. and Wells Fargo Capital Finance, LLC | Letter of Credit      
Revolving Credit Facility [Line Items]      
Letters of credit, additional basis rate 0.50%    
Base rate [Member] | Bank of America, N.A. and Wells Fargo Capital Finance, LLC | Revolving Credit Facility      
Revolving Credit Facility [Line Items]      
Revolving credit facility, additional base rate 0.50%    
Minimum | Bank of America, N.A. and Wells Fargo Capital Finance, LLC | Revolving Credit Facility      
Revolving Credit Facility [Line Items]      
Revolving credit facility, unused capacity, commitment fee percentage 0.25%    
Minimum | London Interbank Offered Rate (LIBOR) | Bank of America, N.A. and Wells Fargo Capital Finance, LLC | Revolving Credit Facility      
Revolving Credit Facility [Line Items]      
Debt Instrument, basis spread on variable rate 1.25%    
Minimum | London Interbank Offered Rate (LIBOR) | Bank of America, N.A. and Wells Fargo Capital Finance, LLC | Letter of Credit      
Revolving Credit Facility [Line Items]      
Debt Instrument, basis spread on variable rate 1.00%    
Minimum | Base rate [Member] | Bank of America, N.A. and Wells Fargo Capital Finance, LLC | Revolving Credit Facility      
Revolving Credit Facility [Line Items]      
Debt Instrument, basis spread on variable rate 0.25%    
Maximum | Bank of America, N.A. and Wells Fargo Capital Finance, LLC | Revolving Credit Facility      
Revolving Credit Facility [Line Items]      
Revolving credit facility, unused capacity, commitment fee percentage 0.375%    
Maximum | London Interbank Offered Rate (LIBOR) | Bank of America, N.A. and Wells Fargo Capital Finance, LLC | Revolving Credit Facility      
Revolving Credit Facility [Line Items]      
Debt Instrument, basis spread on variable rate 2.50%    
Maximum | London Interbank Offered Rate (LIBOR) | Bank of America, N.A. and Wells Fargo Capital Finance, LLC | Letter of Credit      
Revolving Credit Facility [Line Items]      
Debt Instrument, basis spread on variable rate 2.25%    
Maximum | Base rate [Member] | Bank of America, N.A. and Wells Fargo Capital Finance, LLC | Revolving Credit Facility      
Revolving Credit Facility [Line Items]      
Debt Instrument, basis spread on variable rate 1.50%    
Revolving Credit Facility, Liquidity Requirement Component | Bank of America, N.A. and Wells Fargo Capital Finance, LLC | Revolving Credit Facility      
Revolving Credit Facility [Line Items]      
Line of credit facility, remaining borrowing capacity   $ 185,200,000