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Debt (Details) - USD ($)
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Lines of credit | Credit Facilities    
Line of Credit Facility [Line Items]    
Line of credit facility, borrowing capacity increase limit $ 150,000,000.0  
Letters of credit, amount outstanding $ 4,700,000  
Lines of credit | Credit Facilities | Minimum    
Line of Credit Facility [Line Items]    
Unused capacity, commitment fee (percent) 0.25%  
Lines of credit | Credit Facilities | Maximum    
Line of Credit Facility [Line Items]    
Unused capacity, commitment fee (percent) 0.375%  
Lines of credit | Revolving Credit Facility | Credit Facilities    
Line of Credit Facility [Line Items]    
EBITDA to interest expense ratio, maximum (percent) (not more than) 250.00%  
EBITDA to interest expense ratio, minimum (percent) (not less than) 300.00%  
Lines of credit | Revolving Credit Facility | Credit Facilities | Federal Funds Effective Rate    
Line of Credit Facility [Line Items]    
Description of variable rate basis Federal Funds Effective Rate  
Basis spread on variable rate (percent) 0.50%  
Lines of credit | Revolving Credit Facility | Credit Facilities | Eurodollar    
Line of Credit Facility [Line Items]    
Description of variable rate basis Eurodollar rate  
Fix spread on variable rate (percent) 1.00%  
Lines of credit | Revolving Credit Facility | Credit Facilities | Eurodollar | Minimum    
Line of Credit Facility [Line Items]    
Basis spread on variable rate (percent) 1.50%  
Variable spread on variable rate (percent) 0.50%  
Lines of credit | Revolving Credit Facility | Credit Facilities | Eurodollar | Maximum    
Line of Credit Facility [Line Items]    
Basis spread on variable rate (percent) 2.50%  
Variable spread on variable rate (percent) 1.50%  
Lines of credit | Revolving Credit Facility | Revolving Credit Facility Maturing August 2018    
Line of Credit Facility [Line Items]    
Line of credit facility, maximum borrowing capacity $ 100,000,000.0  
Line of credit outstanding 0 $ 0
Lines of credit | Letter of Credit | Revolving Credit Facility Maturing August 2018    
Line of Credit Facility [Line Items]    
Line of credit facility, maximum borrowing capacity 20,000,000.0  
Lines of credit | Swing Line Loan | Revolving Credit Facility Maturing August 2018    
Line of Credit Facility [Line Items]    
Line of credit facility, maximum borrowing capacity 10,000,000.0  
Insurance Notes Payable | AFCO Credit Corporation Insurance Note Payable    
Line of Credit Facility [Line Items]    
Debt instrument, face amount $ 7,600,000.0  
Debt instrument, interest rate (percent) 1.90%  
Total outstanding $ 6,900,000