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Debt (Details) - USD ($)
3 Months Ended
Mar. 31, 2017
Dec. 31, 2016
Mar. 31, 2016
Debt      
Capital Leases, future minimum payments due $ 2,300,000    
Capital Lease Obligations 2,200,000    
Long-term Debt and Capital Lease Obligations, Current 500,000    
Capital lease obligation - net of current portion $ 1,610,000 $ 0 $ 0
Revolving Credit Facility | Base Rate      
Debt      
Credit facility, interest rate basis base rate    
Line of Credit      
Debt      
Credit facility, total available credit $ 303,800,000    
Revolving Credit Facility      
Debt      
Credit facility, total available credit 300,000,000    
Credit facility, unused borrowing capacity 3,800,000    
Line of credit and notes payable $ 0 $ 0 $ 0
Revolving Credit Facility | Minimum      
Debt      
Facility fees on the available commitment of the facility (as a percent) 0.15%    
Interest rate during period 0.47%    
Revolving Credit Facility | Maximum      
Debt      
Facility fees on the available commitment of the facility (as a percent) 0.30%    
Interest rate during period 8.00%    
Revolving Credit Facility | LIBOR      
Debt      
LIBOR rate 0.93%    
Credit facility, interest rate basis LIBOR    
Revolving Credit Facility | LIBOR | Minimum      
Debt      
Credit facility, interest rate spread (as a percent) 0.60%    
Revolving Credit Facility | LIBOR | Maximum      
Debt      
Credit facility, interest rate spread (as a percent) 1.45%    
Revolving Credit Facility | Base Rate | Minimum      
Debt      
Credit facility, interest rate spread (as a percent) 0.00%    
Revolving Credit Facility | Base Rate | Maximum      
Debt      
Credit facility, interest rate spread (as a percent) 0.45%