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Stock-Based Compensation (Narrative) (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands | 3 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Mar. 31, 2017 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Common stock authorized and reserved for issuances |  | 5,560 |  |  |
Shares authorized but not issued |  | 1,786 |  |  |
Total intrinsic value of options and SOSARs exercised |  | $ 4,296 | $ 15,946 | $ 260,466 |
Shares granted |  | 304 | 460 | 379 |
Shares granted |  | 127 | 90 | 47 |
SOSARs outstanding |  | 1,999 | 1,917 | 1,694 | 2,087
Outstanding, end of year, shares |  | 213 | 125 | 116 | 70
Shares vested, fair value |  | $ 3,524 | $ 2,787 | $ 634 |
Stock option and SOSAR exercises (shares) |  | 35 | 124 | 716 |
Shares forfeited |  | 187 | 113 | 56 |
Vested and expected to vest, Weighted-Average Remaining Years of Contractual Life |  | 3 years 8 months 12 days |  |  |
Vested and expected to vest, Aggregate Intrinsic Value |  | $ 209 |  |  |
Granted, Weighted-Average Exercise Price |  | $ 426.70 | $ 457.77 | $ 659.12 |
Non-vested and expected to vest, shares |  | 1,957 |  |  |
First Half Vested [Member] |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Vesting period |  | 2 years |  |  |
Second Half Vested [Member] |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Vesting period |  | 3 years |  |  |
Stock Options And SOSARs [Member] |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Unearned compensation |  | $ 21,998 |  |  |
Weighted average period |  | 1 year 4 months 24 days |  |  |
Performance Shares [Member] |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Vesting period |  | 3 years |  |  |
Outstanding, end of year, shares |  | 133 |  |  |
Shares forfeited |  | 20 |  |  |
Performance Shares [Member] | 2017 Stock Awards [Member] |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Shares granted | 36 |  |  |  |
Performance Shares [Member] | 2016 Stock Awards [Member] |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Shares granted | 73 |  |  |  |
Vesting period |  |  | 3 years |  |
Performance Shares [Member] | 2015 Stock Awards [Member] |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Shares granted |  |  | 40 |  |
Vesting period |  |  |  | 3 years |
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 | $ 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 | $ 427.61 |  |  |  |
Vesting period | 3 years |  |  |  |
Performance SOSARs [Member] |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
SOSARs outstanding |  | 110 |  |  |
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 |  | 278 |  |  |
Non-Vested Stock Awards [Member] |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Weighted-average grant date fair value |  | $ 522.38 |  |  |
Unearned compensation |  | $ 37,962 |  |  |
Weighted average period |  | 1 year 7 months 6 days |  |  |
Vested and expected to vest, Weighted-Average Remaining Years of Contractual Life |  | 5 years 9 months 18 days |  |  |
Vested and expected to vest, Aggregate Intrinsic Value |  | $ 32,829 |  |  |
Non-vested and expected to vest, shares |  | 141 |  |  |
Minimum [Member] | Performance Shares [Member] | 2016 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% |  |
Minimum [Member] | Performance Shares [Member] | 2015 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% |
Minimum [Member] | Performance Shares Grant 1 [Member] | 2017 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% |  |  |  |
Minimum [Member] | Performance Shares Grant 2 [Member] | 2017 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] | Performance Shares [Member] | 2016 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 |  |  | 400.00% |  |
Maximum [Member] | Performance Shares [Member] | 2015 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 |  |  |  | 200.00% |
Maximum [Member] | Performance Shares Grant 1 [Member] | 2017 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 | 350.00% |  |  |  |
Maximum [Member] | Performance Shares Grant 2 [Member] | 2017 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% |  |  |  |

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- Definition The maximum number of shares (or other type of equity) originally approved (usually by shareholders and board of directors), net of any subsequent amendments and adjustments, for awards under the equity-based compensation plan. As stock or unit options and equity instruments other than options are awarded to participants, the shares or units remain authorized and become reserved for issuance under outstanding awards (not necessarily vested). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a)(3) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition The weighted average grant-date fair value of options granted during the reporting period as calculated by applying the disclosed option pricing methodology. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (d)(1) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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