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Summary of Operations and Significant Accounting Policies (Details 3) (USD $)
In Thousands, except Share data, unless otherwise specified
 0 Months Ended 9 Months Ended
Sep. 25, 2013
Sep. 30, 2013
Sep. 25, 2013
Follow-On Offering      
Total shares in follow-on offering     5,290,000
Shares issued upon exercise of underwriters' option to purchase additional share 690,000    
Common stock, issue price (in dollars per share)     $ 60.00
Common stock sold by the entity (in shares) 1,150,000    
Common stock sold by shareholders (in shares) 4,140,000    
Net proceeds from issuance of common stock   $ 65,895  
Offering expenses $ 945