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Stock-Based Compensation (Details 2) (Stock Appreciation Rights (Sars) [Member], USD $)
3 Months Ended
Mar. 31, 2013
Stock Appreciation Rights (Sars) [Member]
 
Non-vested, beginning 161,294
Granted (in shares) 85,943
Vested, (in shares) (70,109)
Non-vested, ending 177,128
Balance, fair value beginning (in dollars per share) $ 31.7
Granted, fair value (in dollars per share) $ 42.14
Vested, fair value (in dollars per share) $ 30.85
Balance, fair value ending (in dollars per share) $ 37.11