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Stock-Based Compensation (Details 4) (Stock Appreciation Rights (Sars) [Member], USD $)
6 Months Ended
Jun. 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 $ 29.35
Non-vested, weighted average grant date fair value $ 36.92
Vested, fair value (in dollars per share) $ 27.49
Balance, fair value ending $ 34.89