Quarterly report pursuant to Section 13 or 15(d)

Debt (Details 2)

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Debt (Details 2) - Unsecured debt - Credit Agreement - USD ($)
$ in Thousands
Dec. 08, 2014
Jun. 30, 2015
Jun. 19, 2014
Revolving credit facility      
Debt      
Credit facility amount     $ 100,000
Increase credit facility, amount     25,000
Commitment fee 0.25%    
Amount outstanding   $ 0  
Revolving credit facility | LIBOR | Minimum      
Debt      
Spread on variable rate basis 1.50%    
Revolving credit facility | LIBOR | Maximum      
Debt      
Spread on variable rate basis 3.25%    
Letter of credit      
Debt      
Credit facility amount     $ 5,000