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Debt (Details)
 3 Months Ended
Mar. 31, 2016
USD ($)
Dec. 31, 2015
USD ($)
Lines of credit | Credit Facilities    
Line of Credit Facility [Line Items]    
Maximum borrowing capacity $ 150,000,000.0  
Letters of credit, amount outstanding $ 5,000,000 $ 4,700,000
Lines of credit | Credit Facilities | Minimum    
Line of Credit Facility [Line Items]    
Commitment fee percentage 0.25%  
Lines of credit | Credit Facilities | Maximum    
Line of Credit Facility [Line Items]    
Commitment fee percentage 0.375%  
Lines of credit | Revolving Credit Facility | Credit Facilities    
Line of Credit Facility [Line Items]    
Maximum debt to adjusted EBITDA ratio 2.50  
Minimum EBITDA to interest expense ratio 3.0  
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  
Fixed spread on variable rate 0.50%  
Lines of credit | Revolving Credit Facility | Credit Facilities | Eurodollar    
Line of Credit Facility [Line Items]    
Description of variable rate basis Eurodollar rate  
Fixed spread on variable rate 1.00%  
Lines of credit | Revolving Credit Facility | Credit Facilities | Eurodollar | Minimum    
Line of Credit Facility [Line Items]    
Variable spread on variable rate 0.50%  
Basis spread on variable rate 1.50%  
Lines of credit | Revolving Credit Facility | Credit Facilities | Eurodollar | Maximum    
Line of Credit Facility [Line Items]    
Variable spread on variable rate 1.50%  
Basis spread on variable rate 2.50%  
Lines of credit | Revolving Credit Facility | Revolving Credit Facility Maturing August 2018    
Line of Credit Facility [Line Items]    
Maximum borrowing capacity limit $ 100,000,000.0  
Lines of credit | Letter of Credit | Revolving Credit Facility Maturing August 2018    
Line of Credit Facility [Line Items]    
Maximum borrowing capacity limit 20,000,000.0  
Lines of credit | Swing Line Loan | Revolving Credit Facility Maturing August 2018    
Line of Credit Facility [Line Items]    
Maximum borrowing capacity limit 10,000,000.0  
Insurance Notes Payable | AFCO Credit Corporation Insurance Notes Payable    
Line of Credit Facility [Line Items]    
Debt instrument, face amount   $ 7,600,000
Debt instrument, interest rate (as a percent)   1.90%
Total outstanding $ 4,200,000 $ 6,900,000