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Stock-Based Compensation (Narrative) (Details) $ / shares in Units, $ in Thousands | 1 Months Ended | 3 Months Ended | 12 Months Ended |
--- | --- | --- | --- | ---
Jul. 31, 2018 USD ($) employee | May 31, 2018 USD ($) | Mar. 31, 2018 | Dec. 31, 2019 USD ($) | Dec. 31, 2018 USD ($) $ / shares shares | Dec. 31, 2017 USD ($) $ / shares shares | Dec. 31, 2016 USD ($) $ / shares shares | Dec. 31, 2015 shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Common stock authorized and reserved for issuances |  |  |  |  | 6,830,000 |  |  |
Shares authorized but not issued |  |  |  |  | 2,626,000 |  |  |
Total intrinsic value of options and SOSARs exercised | $ |  |  |  |  | $ 35,907 | $ 4,296 | $ 15,946 |
Shares granted |  |  |  |  | 741,000 | 304,000 | 460,000 |
Performance shares granted |  |  |  |  | 141,000 | 127,000 | 90,000 |
Outstanding, end of year, shares |  |  |  |  | 224,000 | 213,000 | 125,000 | 116,000
Shares vested, fair value | $ |  |  |  |  | $ 13,509 | $ 3,524 | $ 2,787 |
Units forfeited |  |  |  |  | 91,000 | 31,000 | 74,000 |
Grant date fair value | $ / shares |  |  |  |  | $ 305.00 | $ 436.36 | $ 509.05 |
Non-vested and expected to vest, shares |  |  |  |  | 2,107,000 |  |  |
Stock Options And SOSARs [Member] |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Unearned compensation | $ |  |  |  |  | $ 34,826 |  |  |
Weighted average period |  |  |  |  | 1 year 8 months 12 days |  |  |
Performance Shares [Member] |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Vesting period |  |  |  |  | 3 years |  |  |
Outstanding, end of year, shares |  |  |  |  | 70,000 |  |  |
Units forfeited |  |  |  |  | 62,000 |  |  |
Grant date fair value | $ / shares |  |  |  |  | $ 328.74 |  |  |
Performance Shares [Member] | 2017 Stock Awards [Member] |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Shares granted |  |  |  |  |  | 36,000 |  |
Performance Shares [Member] | 2016 Stock Awards [Member] |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Performance shares granted |  |  |  |  |  |  | 73,000 |
Vesting period |  |  |  |  |  |  | 3 years |
Performance Shares [Member] | 2015 Stock Awards [Member] |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Performance shares granted |  |  |  |  |  | 29,000 |  |
Performance Shares [Member] | Vesting Period 1 [Member] |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Percentage of Shares Vested after Meeting Certain Conditions |  |  | 66.60% |  |  |  |  |
Performance Shares [Member] | Vesting Period 2 [Member] |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Percentage of Shares Vested after Meeting Certain Conditions |  |  | 33.30% |  |  |  |  |
Performance Shares Grant 1 [Member] | 2017 Stock Awards [Member] |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Weighted-average grant date fair value | $ / shares |  |  |  |  |  | $ 485.53 |  |
Vesting period |  |  |  |  |  | 3 years |  |
Performance Shares Grant 2 [Member] | 2017 Stock Awards [Member] |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Weighted-average grant date fair value | $ / shares |  |  |  |  |  | $ 427.61 |  |
Vesting period |  |  |  |  |  | 3 years |  |
Performance SOSARs [Member] |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Shares granted |  |  |  |  | 0 | 0 | 0 |
Performance SOSARs that have met Performance Conditions [Member] |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
SOSARs that have met the performance conditions |  |  |  |  | 253,000 |  |  |
Non-Vested Stock Awards [Member] |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Weighted-average grant date fair value | $ / shares |  |  |  |  | $ 305.00 |  |  |
Unearned compensation | $ |  |  |  |  | $ 33,113 |  |  |
Weighted average period |  |  |  |  | 1 year 7 months 6 days |  |  |
Non-vested and expected to vest, shares |  |  |  |  | 141,000 |  |  |
SOSAR and RSU [Member] |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Share-based compensation adjustment | $ | $ 6,900 | $ 5,360 |  |  |  |  |  |
Number of employees affected by modified service requirements | employee | 340 |  |  |  |  |  |  |
Modified service requirements expense | $ |  |  |  |  | $ 6,705 |  |  |
Performance Shares With Market Conditions [Member] |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Performance shares granted |  |  |  |  | 0 |  |  |
Scenario, Forecast [Member] | SOSAR and RSU [Member] |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Modified service requirements expense | $ |  |  |  | $ 200 |  |  |  |
Minimum [Member] | Performance Shares [Member] | 2018 Stock Awards [Member] |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Vesting percentage |  |  |  |  | 0.00% |  |  |
Minimum [Member] | Performance Shares [Member] | Vesting Period 3 [Member] | 2016 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] | 2018 Stock Awards [Member] |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Vesting percentage |  |  |  |  | 300.00% |  |  |
Maximum [Member] | Performance Shares [Member] | Vesting Period 3 [Member] | 2016 Stock Awards [Member] |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Vesting percentage |  |  |  |  |  |  | 400.00% |
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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- Definition The weighted average fair value at grant date for nonvested equity-based awards issued during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(iii)(1) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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- Definition Number of fully vested and expected to vest options outstanding that can be converted into shares under option plan. Includes, but is not limited to, unvested options for which requisite service period has not been rendered but that are expected to vest based on achievement of performance condition, if forfeitures are recognized when they occur. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (e)(1) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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