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Basis of Presentation (Summary of RSUs Activity) (Details) (Restricted Stock Units (RSUs), USD $)
3 Months Ended
Mar. 31, 2014
Mar. 31, 2013
Restricted Stock Units (RSUs)
   
Shares    
Outstanding at beginning of period (in shares) 353,070 348,897
Granted (in shares) 108,710 113,585
Exercised (in shares) (67,024) (30,288)
Forfeited (in shares) (2,003) (170)
Outstanding at end of period (in shares) 392,753.000 432,024.000
Weighted-Average Grant Date Fair Value    
Outstanding at beginning of period (in dollars per share) $ 18.48 $ 15.75
Granted (in dollars per share) $ 27.29 $ 26.86
Exercised (in dollars per share) $ 15.82 $ 13.95
Forfeited (in dollars per share) $ 17.26 $ 20.64
Outstanding at end of period (in dollars per share) $ 21.50 $ 19.06