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Stock-Based Compensation Stock Appreciation RIghts (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Weighted Average Exercise Price (USD per share)      
OUTSTANDING AT DECEMBER 31, 2015 (USD per share) $ 87.61 $ 95.96  
Weighted average fair vale (USD per share) 105.48 97.48 $ 106.44
OUTSTANDING AT DECEMBER 31, 2016 (USD per Share) $ 104.93 $ 87.61 $ 95.96
Stock Appreciation Rights SARS      
Number of Rights      
OUTSTANDING AT DECEMBER 31, 2015 (shares) 1,704    
Shares granted (shares) 382    
Exercised (shares) (270)    
Shares forfeited (shares) (4)    
Canceled (shares) (1)    
OUTSTANDING AT DECEMBER 31, 2016 (shares) 1,811 1,704  
EXERCISABLE AT DECEMBER 31, 2016 (shares) 1,108    
Weighted Average Exercise Price (USD per share)      
OUTSTANDING AT DECEMBER 31, 2015 (USD per share) $ 83.77    
Weighted average fair vale (USD per share) 113.48    
Exercised (USD per share) 53.50    
Forfeited (USD per share) 100.39    
Canceled (USD per share) 106.44    
OUTSTANDING AT DECEMBER 31, 2016 (USD per Share) 94.51 $ 83.77  
Options, exercisable, weighted average exercise price (USD per share) $ 86.35    
Weighted average remaining contractual term, outstanding share 7 years 4 months 24 days    
Weighted average remaining contractual term, exercisable 6 years 2 months 12 days    
Aggregate intrinsic value, outstanding $ 40,195    
Aggregate intrinsic value, exercisable $ 33,640