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Debt (Details)
3 Months Ended
Mar. 31, 2018
USD ($)
lease
Dec. 31, 2017
USD ($)
Sep. 30, 2017
USD ($)
Mar. 31, 2017
USD ($)
Debt        
Number of capital lease obligations | lease 2      
Capital lease obligations, term 4 years      
Capital lease obligations $ 0 $ 4,400,000   $ 2,131,000
Current portion of the outstanding liability 1,100,000      
Capital lease obligation - net of current portion $ 2,400,000      
Minimum        
Debt        
Capital lease obligations, Interest Rate, Stated Percentage 2.89%      
Maximum        
Debt        
Capital lease obligations, Interest Rate, Stated Percentage 3.50%      
Revolving Credit Facility | Base Rate        
Debt        
Credit facility, interest rate basis base rate      
Line of Credit        
Debt        
Credit facility, total available credit $ 304,200,000      
Revolving Credit Facility        
Debt        
Credit facility, total available credit 300,000,000      
Credit facility, unused borrowing capacity 4,200,000      
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 11.50%      
Revolving Credit Facility | LIBOR        
Debt        
LIBOR rate 1.80%      
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%