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Employee Benefit Plans (Stock Option and Stock Appreciation Rights Outstanding and Exercisable) (Details)
shares in Thousands
12 Months Ended
Dec. 31, 2016
$ / shares
shares
Stock options  
Stock-based compensation plans disclosures  
Stock Options Outstanding, Number of Shares (in shares | shares 366
Stock Options Outstanding, Weighted- Average Exercise Price (in dollars per share) $ 81.12
Stock Options Outstanding, Weighted- Average Remaining Contractual Term 3 years 8 months 12 days
Stock Options Exercisable, Number of Shares | shares 366
Stock Options Exercisable, Weighted- Average Exercise Price (in dollars per share) $ 81.12
Stock appreciation rights  
Stock-based compensation plans disclosures  
Stock Appreciation Rights Outstanding, Number of Shares | shares 1,921
Stock Appreciation Rights Outstanding, Weighted- Average Exercise Price (in dollars per share) $ 44.75
Stock Appreciation Rights Outstanding, Weighted- Average Remaining Contractual Term 6 years 8 months 12 days
Stock Appreciation Rights Exercisable, Number of Shares | shares 622
Stock Appreciation Rights Exercisable, Weighted- Average Exercise Price (in dollars per share) $ 51.93
$13.65 - $29.49 | Stock options  
Stock-based compensation plans disclosures  
Low range of exercise price range (USD per share) 13.65
High range of exercise price range (USD per share) $ 29.49
Stock Options Outstanding, Number of Shares (in shares | shares 40
Stock Options Outstanding, Weighted- Average Exercise Price (in dollars per share) $ 14.40
Stock Options Outstanding, Weighted- Average Remaining Contractual Term 2 years 2 months 12 days
Stock Options Exercisable, Number of Shares | shares 40
Stock Options Exercisable, Weighted- Average Exercise Price (in dollars per share) $ 14.40
$13.65 - $29.49 | Stock appreciation rights  
Stock-based compensation plans disclosures  
Share Based Compensation Shares Authorized Under Equity Plans Other than Options Exercise Price Range Lower Range Limit 13.65
Share Based Compensation Shares Authorized Under Equity Plans Other than Options Exercise Price Range Upper Range Limit $ 29.49
Stock Appreciation Rights Outstanding, Number of Shares | shares 113
Stock Appreciation Rights Outstanding, Weighted- Average Exercise Price (in dollars per share) $ 27.72
Stock Appreciation Rights Outstanding, Weighted- Average Remaining Contractual Term 6 years 8 months 12 days
Stock Appreciation Rights Exercisable, Number of Shares | shares 13
Stock Appreciation Rights Exercisable, Weighted- Average Exercise Price (in dollars per share) $ 13.65
$29.78 - $47.99 | Stock options  
Stock-based compensation plans disclosures  
Low range of exercise price range (USD per share) 29.78
High range of exercise price range (USD per share) $ 47.99
Stock Options Outstanding, Number of Shares (in shares | shares 90
Stock Options Outstanding, Weighted- Average Exercise Price (in dollars per share) $ 36.36
Stock Options Outstanding, Weighted- Average Remaining Contractual Term 2 years
Stock Options Exercisable, Number of Shares | shares 90
Stock Options Exercisable, Weighted- Average Exercise Price (in dollars per share) $ 36.36
$29.78 - $47.99 | Stock appreciation rights  
Stock-based compensation plans disclosures  
Share Based Compensation Shares Authorized Under Equity Plans Other than Options Exercise Price Range Lower Range Limit 29.78
Share Based Compensation Shares Authorized Under Equity Plans Other than Options Exercise Price Range Upper Range Limit $ 47.99
Stock Appreciation Rights Outstanding, Number of Shares | shares 1,561
Stock Appreciation Rights Outstanding, Weighted- Average Exercise Price (in dollars per share) $ 38.11
Stock Appreciation Rights Outstanding, Weighted- Average Remaining Contractual Term 7 years
Stock Appreciation Rights Exercisable, Number of Shares | shares 455
Stock Appreciation Rights Exercisable, Weighted- Average Exercise Price (in dollars per share) $ 36.76
$55.04 - $83.83 | Stock options  
Stock-based compensation plans disclosures  
Low range of exercise price range (USD per share) 55.04
High range of exercise price range (USD per share) $ 83.83
Stock Options Outstanding, Number of Shares (in shares | shares 92
Stock Options Outstanding, Weighted- Average Exercise Price (in dollars per share) $ 80.80
Stock Options Outstanding, Weighted- Average Remaining Contractual Term 4 years 3 months 18 days
Stock Options Exercisable, Number of Shares | shares 92
Stock Options Exercisable, Weighted- Average Exercise Price (in dollars per share) $ 80.80
$55.04 - $83.83 | Stock appreciation rights  
Stock-based compensation plans disclosures  
Share Based Compensation Shares Authorized Under Equity Plans Other than Options Exercise Price Range Lower Range Limit 55.04
Share Based Compensation Shares Authorized Under Equity Plans Other than Options Exercise Price Range Upper Range Limit $ 83.83
Stock Appreciation Rights Outstanding, Number of Shares | shares 138
Stock Appreciation Rights Outstanding, Weighted- Average Exercise Price (in dollars per share) $ 79.00
Stock Appreciation Rights Outstanding, Weighted- Average Remaining Contractual Term 5 years 6 months
Stock Appreciation Rights Exercisable, Number of Shares | shares 65
Stock Appreciation Rights Exercisable, Weighted- Average Exercise Price (in dollars per share) $ 79.50
$95.91 - $131.46 | Stock options  
Stock-based compensation plans disclosures  
Low range of exercise price range (USD per share) 95.91
High range of exercise price range (USD per share) $ 131.46
Stock Options Outstanding, Number of Shares (in shares | shares 144
Stock Options Outstanding, Weighted- Average Exercise Price (in dollars per share) $ 127.98
Stock Options Outstanding, Weighted- Average Remaining Contractual Term 4 years 9 months 18 days
Stock Options Exercisable, Number of Shares | shares 144
Stock Options Exercisable, Weighted- Average Exercise Price (in dollars per share) $ 127.98
$95.91 - $131.46 | Stock appreciation rights  
Stock-based compensation plans disclosures  
Share Based Compensation Shares Authorized Under Equity Plans Other than Options Exercise Price Range Lower Range Limit 95.91
Share Based Compensation Shares Authorized Under Equity Plans Other than Options Exercise Price Range Upper Range Limit $ 131.46
Stock Appreciation Rights Outstanding, Number of Shares | shares 109
Stock Appreciation Rights Outstanding, Weighted- Average Exercise Price (in dollars per share) $ 114.42
Stock Appreciation Rights Outstanding, Weighted- Average Remaining Contractual Term 4 years 6 months
Stock Appreciation Rights Exercisable, Number of Shares | shares 89
Stock Appreciation Rights Exercisable, Weighted- Average Exercise Price (in dollars per share) $ 115.01