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Long-Term Debt (Narrative) (Details) - USD ($)
3 Months Ended
Jan. 24, 2019
Mar. 31, 2019
Dec. 31, 2018
Mar. 31, 2013
Jan. 31, 2013
Debt Instrument [Line Items]          
Carrying value of outstanding debt   $ 2,000,000 $ 210,405,000    
Senior Subordinated 6.25% Notes          
Debt Instrument [Line Items]          
Debt instrument, issued value         $ 210,000,000
Carrying value of outstanding debt   $ 0 $ 210,000,000    
Senior Subordinated Notes, interest rate   6.25% 6.25% 6.25%  
Write off of deferred debt issuance cost   $ 1,100,000      
Revolving Credit Facility | Senior Credit Agreement          
Debt Instrument [Line Items]          
Revolving credit facility, availability amount   391,900,000      
Borrowings outstanding   0 $ 0    
Standby Letters of Credit | Senior Credit Agreement          
Debt Instrument [Line Items]          
Letters of credit issued   $ 8,129,000      
Line of Credit | 2019 Senior Credit Agreement          
Debt Instrument [Line Items]          
Current borrowing capacity $ 400,000,000        
Letters of credit issued 700,000,000        
Medium-term Notes | 2019 Senior Credit Agreement          
Debt Instrument [Line Items]          
Debt instrument, issued value $ 300,000,000        
Minimum | Line of Credit | 2019 Senior Credit Agreement          
Debt Instrument [Line Items]          
Commitment fee percentage 0.15%        
Maximum | Line of Credit | 2019 Senior Credit Agreement          
Debt Instrument [Line Items]          
Commitment fee percentage 0.25%        
LIBOR | Minimum | Line of Credit | 2019 Senior Credit Agreement          
Debt Instrument [Line Items]          
Debt Instrument, Basis Spread on Variable Rate 1.125%        
LIBOR | Maximum | Line of Credit | 2019 Senior Credit Agreement          
Debt Instrument [Line Items]          
Debt Instrument, Basis Spread on Variable Rate 2.00%