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Debt (Details) - USD ($)
 6 Months Ended
Jun. 30, 2015
Dec. 31, 2014
Jun. 30, 2014
Debt      
Credit facility, maximum borrowing capacity $ 304,400,000    
Primary revolving line of credit      
Debt      
Credit facility, maximum borrowing capacity $ 300,000,000    
Primary revolving line of credit | Minimum      
Debt      
Facility fees on the available commitment of the facility (as a percent) 0.15%    
Primary revolving line of credit | Maximum      
Debt      
Facility fees on the available commitment of the facility (as a percent) 0.30%    
Primary revolving line of credit | LIBOR      
Debt      
LIBOR Rate at end of period (as a percent) 0.19%    
Credit facility, interest rate basis LIBOR    
Primary revolving line of credit | LIBOR | Minimum      
Debt      
Credit facility, interest rate spread (as a percent) 0.60%    
Primary revolving line of credit | LIBOR | Maximum      
Debt      
Credit facility, interest rate spread (as a percent) 1.45%    
Primary revolving line of credit | Base rate      
Debt      
Credit facility, interest rate basis base rate    
Primary revolving line of credit | Base rate | Minimum      
Debt      
Credit facility, interest rate spread (as a percent) 0.00%    
Primary revolving line of credit | Base rate | Maximum      
Debt      
Credit facility, interest rate spread (as a percent) 0.45%    
Other revolving credit lines and long term debt      
Debt      
Total borrowing capacity $ 4,400,000    
Credit facility, interest rate low end of range (as a percent) 0.79%    
Credit facility, interest rate high end of range (as a percent) 7.25%    
Total outstanding balances $ 0 $ 18,000 $ 62,000