Quarterly report pursuant to Section 13 or 15(d)

Debt (CredAg) (Details)

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Debt (CredAg) (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2014
Sep. 30, 2015
Credit Agreement    
Debt    
Credit facility amount $ 100,000  
Increase credit facility, amount $ 25,000  
Commitment fee 0.25%  
Amount outstanding   $ 0
Credit Agreement | LIBOR | Minimum    
Debt    
Spread on variable rate basis 1.50%  
Credit Agreement | LIBOR | Maximum    
Debt    
Spread on variable rate basis 3.25%  
Letter of credit    
Debt    
Credit facility amount $ 5,000