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Line of Credit (Details) (Facility, USD $)
6 Months Ended
Jun. 30, 2013
Aug. 02, 2013
Line of Credit    
Borrowing capacity $ 75,000,000  
Maximum effective interest rate (as a percent) 4.75%  
Unused facility fee (as a percent) 0.25%  
Amount outstanding under the facility $ 0 $ 0
LIBOR
   
Line of Credit    
Basis of interest rate 90 day LIBOR  
Spread on variable interest rate (as a percent) 3.00%  
Interest rate at end of period (as a percent) 3.27%