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Stock Incentive Plans (SSAR Activity) (Details) (USD $)
12 Months Ended
Dec. 31, 2011
SSARs outstanding at December 31 458,244
Settled Stock Appreciation Rights [Member]
 
SSARs outstanding at January 1 798,197
SSARs granted 164,425
SSARs exercised 130,062
SSARs canceled or forfeited (500)
SSARs outstanding at December 31 832,060
SSAR price ranges per share, canceled or forfeited $ 56.98
Weighted average SSAR exercise prices per share, Granted $ 51.53
Weighted average SSAR exercise prices per share, Exercised $ 27.78
Weighted average SSAR exercise prices per share, Canceled or forfeited $ 56.98
Weighted average SSAR exercise prices per share Outstanding at December 31 $ 36.78
Minimum [Member]
 
SSAR price ranges per share, Granted $ 43.39
SSAR price ranges per share, Exercised $ 21.45
Maximum [Member]
 
SSAR price ranges per share, Granted $ 52.29
SSAR price ranges per share, Exercised $ 37.38