Annual report pursuant to Section 13 and 15(d)

Long-Term Debt - Other (Details)

v3.8.0.1
Long-Term Debt - Other (Details) - New Credit Agreement
$ in Thousands
12 Months Ended
May 05, 2017
Dec. 31, 2017
USD ($)
Dec. 31, 2016
USD ($)
Debt covenants      
Maximum Net Leverage Ratio   3.25  
Minimum FCCR   1.25  
Revolving Facility      
Long-Term Debt      
Revolving Facility   $ 250,000 $ 125,000
Less: standby letters of credit   (47,055) (49,080)
Capacity under Revolving Facility   $ 202,945 $ 75,920
Debt Covenants Term Period One      
Debt covenants      
Maximum Net Leverage Ratio 3.25    
Minimum FCCR 1.25    
Debt Covenants Term Period Two      
Debt covenants      
Maximum Net Leverage Ratio 3.00    
Minimum FCCR 1.25