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Stock Incentive Plan (SSAR Activity) (Details) (USD $)
12 Months Ended
Dec. 31, 2013
Current Fiscal Year End Date --12-31
Minimum
 
Share Activity  
SSAR price ranges per share, Granted $ 51.84
SSAR price ranges per share, Exercised $ 21.45
SSAR price ranges per share, Canceled $ 21.45
Maximum
 
Share Activity  
SSAR price ranges per share, Granted $ 63.64
SSAR price ranges per share, Exercised $ 56.98
SSAR price ranges per share, Canceled $ 56.98
Stock Appreciation Rights (SARs)
 
Share Activity  
SSARs, beginning of period 1,073,087
SSARs granted 335,630
SSARs exercised (251,536)
SSARs canceled or forfeited (62,345)
SSARs, end of period 1,094,836
Weighted average SSAR exercise prices per share, Granted $ 52.96
Weighted average SSAR exercise prices per share, Exercised $ 33.74
Weighted average SSAR exercise prices per share, Canceled or forfeited $ 49.86
Weighted average SSAR exercise prices per share Outstanding at December 31 $ 46.35