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Employee Benefit Plans (Details) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 9 Months Ended
Sep. 30, 2014
Sep. 30, 2013
Sep. 30, 2014
Sep. 30, 2013
Employee Benefit Plans        
Annual discretionary employer matching contributions (as a percent)     3.00%  
Employer matching contributions $ 264 $ 186 $ 710 $ 503