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Stock-Based Compensation (Narrative) (Details) $ / shares in Units, $ in Thousands | 12 Months Ended
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Dec. 31, 2019 USD ($) item shares | Dec. 31, 2018 USD ($) $ / shares shares | Dec. 31, 2017 USD ($) $ / shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Common stock authorized and reserved for issuances | shares | 6,830,000 |  |
Shares authorized but not issued | shares | 2,321,000 |  |
Stock Options And SOSARs [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Unearned compensation | $ 30,338 |  |
Weighted average period | 1 year 6 months |  |
Restricted Stock Units [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Grant date fair value | $ / shares |  | $ 299.25 | $ 414.36
Unearned compensation | $ 14,803 |  |
Weighted average period | 1 year 4 months 24 days |  |
Shares vested, fair value | $ 27,197 | $ 4,192 | $ 3,524
Performance Shares [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Grant date fair value | $ / shares |  | $ 327.58 | $ 466.29
Unearned compensation | $ 60,921 |  |
Weighted average period | 2 years 2 months 12 days |  |
Shares vested, fair value | $ 0 | $ 9,317 | $ 0
Vesting period | 3 years |  |
Number of types of PSU awards | item | 2 |  |
Performance Shares [Member] | 2018 Stock Awards [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Performance and market measurement period |  | 3 years |
Performance Shares [Member] | Vesting Period 1 [Member] | 2017 Stock Awards [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Percentage of Shares Vested after Meeting Certain Conditions |  |  | 66.66%
Performance Shares [Member] | Vesting Period 2 [Member] | 2017 Stock Awards [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Percentage of Shares Vested after Meeting Certain Conditions |  |  | 33.33%
Performance Shares Grant 1 [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Performance shares granted | shares | 33 |  |
Vesting period | 3 years |  |
Performance Shares Grant 1 [Member] | 2017 Stock Awards [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Vesting period |  |  | 3 years
Performance Shares Grant 2 [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Performance shares granted | shares | 13 |  |
Performance Shares Grant 2 [Member] | 2017 Stock Awards [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Vesting period |  |  | 3 years
Performance Shares Grant 2 [Member] | First Half Vested [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Vesting period | 3 years |  |
Vesting percentage | 40.00% |  |
Performance Shares Grant 2 [Member] | Second Half Vested [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Vesting period | 4 years |  |
Vesting percentage | 60.00% |  |
SOSAR [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Total intrinsic value of options and SOSARs exercised | $ 219,984 | $ 35,907 | $ 4,296
Performance Shares With Market Conditions [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Performance shares granted | shares | 0 | 0 |
Minimum [Member] | Performance Shares [Member] | Vesting Period 1 [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Vesting percentage | 0.00% |  |
Minimum [Member] | Performance Shares [Member] | Vesting Period 1 [Member] | 2018 Stock Awards [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Vesting percentage |  | 0.00% |
Minimum [Member] | Performance Shares Grant 1 [Member] | Vesting Period 1 [Member] | 2017 Stock Awards [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Vesting percentage |  |  | 0.00%
Minimum [Member] | Performance Shares Grant 2 [Member] | Vesting Period 2 [Member] | 2017 Stock Awards [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Vesting percentage |  |  | 0.00%
Maximum [Member] | Performance Shares [Member] | Vesting Period 1 [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Vesting percentage | 300.00% |  |
Maximum [Member] | Performance Shares [Member] | Vesting Period 1 [Member] | 2018 Stock Awards [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Vesting percentage |  | 300.00% |
Maximum [Member] | Performance Shares Grant 1 [Member] | Vesting Period 1 [Member] | 2017 Stock Awards [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Vesting percentage |  |  | 350.00%
Maximum [Member] | Performance Shares Grant 2 [Member] | Vesting Period 2 [Member] | 2017 Stock Awards [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Vesting percentage |  |  | 300.00%

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