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Stock-Based Compensation (Narrative) (Details)
$ / shares in Units, shares in Thousands, $ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2018
USD ($)
Sep. 30, 2017
USD ($)
Sep. 30, 2018
USD ($)
employee
$ / shares
shares
Sep. 30, 2017
USD ($)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Share-based Compensation Adjustment | $ [1] $ 6,087 $ 0 $ (339) $ 0
Stock Options And SOSARs [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Shares granted     668  
Weighted-average grant date fair value | $ / shares     $ 71.87  
Stock option and SOSAR exercises (shares)     395  
Units forfeited     146  
Units expired     1  
Granted, Weighted-Average Exercise Price | $ / shares     $ 391.28  
Stock Options And SOSARs [Member] | Vesting Period 1 [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Vesting period     2 years  
Stock Options And SOSARs [Member] | Vesting Period 2 [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Vesting period     3 years  
Stock Options And SOSARs [Member] | 3 Equal Installment Vesting [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Shares granted     168  
Vesting period     3 years  
Stock Options And SOSARs [Member] | 18 Month Vesting [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Shares granted     175  
Vesting period     18 months  
Restricted Stock Units [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Shares granted     110  
Weighted-average grant date fair value | $ / shares     $ 325.58  
Units forfeited     19  
Units released     6  
Restricted Stock Units [Member] | Vesting Period 1 [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Vesting period     2 years  
Restricted Stock Units [Member] | Vesting Period 2 [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Vesting period     3 years  
Performance Shares [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Units vested     29  
Units forfeited     24  
Performance Shares [Member] | 2018 Stock Awards [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Performance shares granted     29  
Weighted-average grant date fair value | $ / shares     $ 327.58  
SOSAR and RSU [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Cumulative adjustment of expense reduction | $     $ 5,360  
Share-based Compensation Adjustment | $     $ 5,021  
Number of employees affected by modified service requirements | employee     340  
Minimum [Member] | Stock Options And SOSARs [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Exercise price premium     110.00%  
Minimum [Member] | Performance Shares [Member] | 2018 Stock Awards [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage     0.00%  
Maximum [Member] | Stock Options And SOSARs [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Exercise price premium     160.00%  
Maximum [Member] | Performance Shares [Member] | 2018 Stock Awards [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage     300.00%  
Maximum [Member] | SOSAR and RSU [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Share-based Compensation Adjustment | $     $ 7,000  
[1] Recorded in general and administrative expenses on the condensed consolidated statement of income.