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Share-Based Payments (Schedule of Stock Option Activity) (Details) (USD $)
 3 Months Ended
Mar. 31, 2013
Shares  
Outstanding, beginning balance 716,235
Options granted 9,000
Options cancelled (400)
Options exercised (21,325)
Outstanding, ending balance 703,510
Options exercisable 359,710
Options available for future grants 584,075
Weighted Average Exercise Price  
Outstanding, beginning balance $ 14.41
Options granted $ 21.95
Options cancelled $ 19.33
Options exercised $ 11.98
Outstanding, ending balance $ 14.57
Options exercisable $ 12.25