Quarterly report pursuant to Section 13 or 15(d)

Long-Term Debt - Other (Details)

v3.8.0.1
Long-Term Debt - Other (Details)
$ in Thousands
3 Months Ended
Mar. 31, 2018
USD ($)
Dec. 31, 2017
USD ($)
Amended Credit Agreement    
Debt covenants    
Maximum Net Leverage Ratio 3.50  
Minimum FCCR 1.25  
Revolving Facility    
Long-Term Debt    
Revolving Facility $ 250,000 $ 250,000
Less: standby letters of credit (47,055) (47,055)
Capacity under Revolving Facility 202,945 $ 202,945
Revolving Facility | Amended Credit Agreement    
Long-Term Debt    
Revolving Facility $ 250,000  
Debt Covenants Term Period One | Amended Credit Agreement    
Debt covenants    
Maximum Net Leverage Ratio 3.25  
Minimum FCCR 1.25  
Debt Covenants Term Period Two | Amended Credit Agreement    
Debt covenants    
Maximum Net Leverage Ratio 3.00  
Minimum FCCR 1.25