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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, 2018
Dec. 31, 2017
Weighted Average Exercise Price (USD per share)    
OUTSTANDING AT DECEMBER 31, 2017 (USD per share) $ 119.88 $ 104.93
OUTSTANDING AT DECEMBER 31, 2018 (USD per Share)   $ 119.88
Stock Appreciation Rights SARS    
Number of Rights    
OUTSTANDING AT DECEMBER 31, 2017 (shares) 2,042  
Shares granted (shares) 369  
Exercised (shares) (279)  
Forfeited (shares) (21)  
Canceled (shares) 0  
OUTSTANDING AT DECEMBER 31, 2018 (shares) 2,111 2,042
EXERCISABLE AT DECEMBER 31, 2018 (shares) 1,342  
Weighted Average Exercise Price (USD per share)    
OUTSTANDING AT DECEMBER 31, 2017 (USD per share) $ 103.59  
Granted (USD per share) 107.23  
Exercised (USD per share) 81.21  
Forfeited (USD per share) 121.33  
Canceled (USD per share) 0.00  
OUTSTANDING AT DECEMBER 31, 2018 (USD per Share) 107.01 $ 103.59
EXCERCISABLE AT DECEMBER 31, 2018 (USD per share) $ 102.19  
Weighted average remaining contractual term, outstanding 7 years 3 months  
Weighted average remaining contractual term, exercisable 6 years 2 months 12 days  
Aggregate intrinsic value, outstanding $ 6,685  
Aggregate intrinsic value, exercisable $ 6,685