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Stock-Based Compensation (Details 4) (Stock Appreciation Rights (Sars) [Member], USD $)
9 Months Ended
Sep. 30, 2012
Stock Appreciation Rights (Sars) [Member]
 
Non-vested, beginning 144,321
Granted, (in shares) 83,968
Vested, (in shares) (80,758)
Non-vested, ending 147,531
Balance, fair value beginning (in dollars per share) $ 29.35
Granted, fair value (in dollars per share) $ 36.92
Vested, fair value (in dollars per share) $ 27.49
Balance, fair value ending (in dollars per share) $ 34.89