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Debt (Details)
 12 Months Ended
Dec. 31, 2016
USD ($)
Dec. 31, 2015
USD ($)
Lines of credit | Credit Facilities    
Line of Credit Facility [Line Items]    
Maximum additional borrowing capacity $ 150,000,000.0  
Letters of credit, amount outstanding $ 3,700,000 $ 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]    
Total consolidated funded debt to adjusted EBITDA ratio, maximum (percent) (not more than) 2.50  
EBITDA to interest expense ratio, minimum (percent) (not less than) 3.0  
Lines of credit | Revolving Credit Facility | Credit Facilities | Federal Funds Effective Rate    
Line of Credit Facility [Line Items]    
Basis spread on variable rate (percent) 0.50%  
Lines of credit | Revolving Credit Facility | Credit Facilities | Eurodollar    
Line of Credit Facility [Line Items]    
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]    
Maximum borrowing capacity $ 100,000,000.0  
Line of credit, remaining borrowing capacity 50,000,000  
Lines of credit | Swing Line Loan | Revolving Credit Facility Maturing August 2018    
Line of Credit Facility [Line Items]    
Maximum borrowing capacity 10,000,000.0  
Lines of credit | Letter of Credit | Revolving Credit Facility Maturing August 2018    
Line of Credit Facility [Line Items]    
Maximum borrowing capacity 20,000,000.0  
Lines of credit | Citibank Credit Facility    
Line of Credit Facility [Line Items]    
Maximum borrowing capacity 6,000,000.0  
Letters of credit, amount outstanding $ 2,200,000  
Line of credit, expiration period (in years) 3 years  
Line of credit, fixed interest rate short-term (percent) 1.25%  
Line of credit, fixed interest rate long-term (percent) 1.50%  
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 $ 0 $ 6,900,000