Quarterly report pursuant to Section 13 or 15(d)

Long-Term Debt and Notes Payable (Details)

v3.10.0.1
Long-Term Debt and Notes Payable (Details)
6 Months Ended
Jun. 30, 2018
USD ($)
fiscal_quarter
Debt Instrument  
Duration of permitted leverage ratio following acquisition, number of fiscal quarters | fiscal_quarter 4
Leverage ratio 2.80
Fourth Amended and Restated Credit Agreement | Line of Credit | Revolving Credit Facility  
Debt Instrument  
Maximum borrowing capacity $ 350,000,000
Line of credit facility increase amount $ 150,000,000
Amended and Restated Credit Agreement  
Debt Instrument  
Ratio of funded debt to Adjusted EBITDA 3.75
Amended and Restated Credit Agreement | Maximum  
Debt Instrument  
Ratio of funded debt to Adjusted EBITDA 4.50
Amended and Restated Credit Agreement | Line of Credit | Revolving Credit Facility  
Debt Instrument  
Maximum borrowing capacity $ 500,000,000
Line of credit facility increase amount 150,000,000
Credit facility outstanding 257,000,000
Revolving credit facility remaining $ 241,900,000
Amended and Restated Credit Agreement | Line of Credit | Revolving Credit Facility | Minimum  
Debt Instrument  
Basis points for commitment fee 0.10%
Amended and Restated Credit Agreement | Line of Credit | Revolving Credit Facility | Minimum | LIBOR  
Debt Instrument  
Basis points for variable interest rate 1.00%
Amended and Restated Credit Agreement | Line of Credit | Revolving Credit Facility | Maximum  
Debt Instrument  
Basis points for commitment fee 0.20%
Amended and Restated Credit Agreement | Line of Credit | Revolving Credit Facility | Maximum | LIBOR  
Debt Instrument  
Basis points for variable interest rate 1.50%
Amended and Restated Credit Agreement | Line of Credit | Letter of Credit  
Debt Instrument  
Credit facility allocated (up to) $ 20,000,000
Outstanding letters of credit $ 1,100,000