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Investments In Securities Investments in Securities (Schedule of Carrying Value and Fair Value of Financial Assets Disclosed) (Details) - USD ($) $ in Thousands | Sep. 30, 2018 | Dec. 31, 2017 | Dec. 31, 2016
--- | --- | --- | ---
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Cash | $ 36,862 | $ 20,214 |
Accrued interest and dividends | 1,242 | 1,100 |
Equity Securities, Estimated Fair Value | 51,372 | 47,367 |
Commercial paper, money market funds and certificates of deposit | 27,693 | 23,780 |
Equity investments in unconsolidated affiliates, equity method | 6,129 | 6,593 |
Equity investments in unconsolidated affiliates, measurement alternative | 5,868 | 5,439 | $ 4,744
Assets, Fair Value Disclosure | 129,166 | 104,493 |
Level 1 |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Cash | 36,862 | 20,214 |
Accrued interest and dividends | 1,242 | 1,100 |
Equity Securities, Estimated Fair Value | 51,372 | 47,367 |
Commercial paper, money market funds and certificates of deposit | 27,693 | 23,780 |
Equity investments in unconsolidated affiliates, equity method | 0 | 0 |
Equity investments in unconsolidated affiliates, measurement alternative | 0 | 0 |
Assets, Fair Value Disclosure | 117,169 | 92,461 |
Level 2 |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Cash | 0 | 0 |
Accrued interest and dividends | 0 | 0 |
Equity Securities, Estimated Fair Value | 0 | 0 |
Commercial paper, money market funds and certificates of deposit | 0 | 0 |
Equity investments in unconsolidated affiliates, equity method | 0 | 0 |
Equity investments in unconsolidated affiliates, measurement alternative | 0 | 0 |
Assets, Fair Value Disclosure | 0 | 0 |
Level 3 |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Cash | 0 | 0 |
Accrued interest and dividends | 0 | 0 |
Equity Securities, Estimated Fair Value | 0 | 0 |
Commercial paper, money market funds and certificates of deposit | 0 | 0 |
Equity investments in unconsolidated affiliates, equity method | 6,129 | 6,593 |
Equity investments in unconsolidated affiliates, measurement alternative | 5,868 | 5,439 |
Assets, Fair Value Disclosure | $ 11,997 | $ 12,032 |

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- Definition Fair value portion of probable future economic benefits obtained or controlled by an entity as a result of past transactions or events. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=99377789&loc=d3e19207-110258 + Details
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