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Stock-Based Compensation Stock Appreciation RIghts (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
1 Months Ended 12 Months Ended
Dec. 31, 2014
Dec. 31, 2015
Dec. 31, 2014
Weighted Average Exercise Price (USD per share)      
OUTSTANDING AT DECEMBER 31, 2014 (USD per share)   $ 95.96  
Weighted average fair vale (USD per share) $ 97.48 97.48 $ 106.44
OUTSTANDING AT DECEMBER 31, 2015 (USD per Share) $ 95.96 $ 87.61 $ 95.96
Stock Appreciation Rights SARS      
Number of Rights      
OUTSTANDING AT DECEMBER 31, 2014 (shares)   1,465  
Shares granted (shares)   364  
Exercised (shares)   (102)  
Shares forfeited (shares)   (14)  
Canceled (shares)   (9)  
OUTSTANDING AT DECEMBER 31, 2015 (shares) 1,465 1,704 1,465
EXERCISABLE AT DECEMBER 31, 2015 (shares)   1,101  
Weighted Average Exercise Price (USD per share)      
OUTSTANDING AT DECEMBER 31, 2014 (USD per share)   $ 78.64  
Weighted average fair vale (USD per share)   97.87  
Exercised (USD per share)   59.37  
Forfeited (USD per share)   104.07  
Canceled (USD per share)   59.50  
OUTSTANDING AT DECEMBER 31, 2015 (USD per Share) $ 78.64 83.77 $ 78.64
Options, exercisable, weighted average exercise price (USD per share)   $ 74.04  
Weighted average remaining contractual term, outstanding share   7 years 2 months 12 days  
Weighted average remaining contractual term, exercisable   6 years 1 month 6 days  
Aggregate intrinsic value, outstanding   $ 32,492  
Aggregate intrinsic value, exercisable   $ 31,237