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Equity (Details) (USD $)
In Thousands, except Share data, unless otherwise specified
1 Months Ended 9 Months Ended
Jul. 31, 2014
Sep. 30, 2014
Sep. 30, 2013
Equity      
Number of shares of common stock sold in public offering 2,447,247    
Public offering price of common shares (in dollars per share) $ 42.50    
Common stock issued upon exercise of option (in shares) 397,087    
Net proceeds after deducting underwriting discounts, commissions and expenses payable $ 112,800 $ 112,837 $ 340
Issuance of stock, underwriting discounts, commissions and expenses $ 794