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Share-Based Payments (Summary of Stock Options Exercised) (Details) (USD $)
In Thousands, unless otherwise specified
3 Months Ended
Mar. 31, 2014
Mar. 31, 2013
Share-Based Payments [Abstract]    
Cash proceeds from stock options exercised $ 695 $ 256
Tax benefits    21
Intrinsic value of stock options exercised $ 1,455 $ 235