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Debt (Details) - USD ($)
6 Months Ended
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2016
Jun. 30, 2016
Debt        
Capital Leases, future minimum payments due   $ 2,300,000    
Capital lease obligations $ 2,200,000      
Current portion of the outstanding liability 500,000      
Capital lease obligation - net of current portion $ 1,477,000   $ 0 $ 0
Revolving Credit Facility | Base Rate        
Debt        
Credit facility, interest rate basis base rate      
Line of Credit        
Debt        
Credit facility, total available credit $ 304,000,000      
Revolving Credit Facility        
Debt        
Credit facility, total available credit 300,000,000      
Credit facility, unused borrowing capacity 4,000,000      
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 8.25%      
Revolving Credit Facility | LIBOR        
Debt        
LIBOR rate 1.17%      
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%