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Basis of Presentation (Summary of RSUs Activity) (Details) (Restricted Stock Units (RSUs), USD $)
9 Months Ended
Sep. 30, 2014
Sep. 30, 2013
Restricted Stock Units (RSUs)
   
Shares    
Outstanding at beginning of period (in shares) 353,070 348,897
Granted (in shares) 133,139 126,685
Vested (in shares) (74,521) (43,388)
Forfeited (in shares) (7,483) (57,982)
Outstanding at end of period (in shares) 404,205 374,212
Weighted-Average Grant Date Fair Value    
Outstanding at beginning of period (in dollars per share) $ 18.62 $ 15.75
Granted (in dollars per share) $ 26.65 $ 26.92
Vested (in dollars per share) $ 16.95 $ 17.00
Forfeited (in dollars per share) $ 20.22 $ 19.08
Outstanding at end of period (in dollars per share) $ 21.44 $ 19.02