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Long-Term Debt (Narrative) (Details)
9 Months Ended
Sep. 30, 2019
USD ($)
covenant
Jan. 24, 2019
USD ($)
Dec. 31, 2018
USD ($)
Mar. 31, 2013
Jan. 31, 2013
USD ($)
Debt Instrument [Line Items]          
Carrying value of outstanding debt $ 0   $ 210,400,000    
Unamortized debt issuance costs     1,600,000    
Current maturities of long-term debt 0   208,805,000    
Senior Subordinated Notes [Member]          
Debt Instrument [Line Items]          
Debt instrument, issued value     $ 210,000,000.0    
Senior Subordinated Notes, interest rate     6.25%    
Other Debt Obligations [Member]          
Debt Instrument [Line Items]          
Carrying value of outstanding debt     $ 2,000,000.0    
Senior Subordinated 6.25% Notes          
Debt Instrument [Line Items]          
Carrying value of outstanding debt     $ 210,000,000    
Debt instrument, issued value         $ 210,000,000
Senior Subordinated Notes, interest rate     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 394,000,000.0        
Borrowings outstanding 0   $ 0    
Standby Letters of Credit | Senior Credit Agreement          
Debt Instrument [Line Items]          
Letters of credit issued $ 6,000,000.0        
Line of Credit | 2019 Senior Credit Agreement          
Debt Instrument [Line Items]          
Current borrowing capacity   $ 400,000,000      
Letters of credit issued   700,000,000      
Number of debt covenants | covenant 3        
Medium-term Notes | 2019 Senior Credit Agreement          
Debt Instrument [Line Items]          
Debt instrument, issued value   $ 300,000,000