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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, 2019 | Dec. 31, 2018 | Dec. 31, 2017
--- | --- | --- | ---
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Cash and cash equivalents | $ 43,992 | $ 18,694 |
Accrued interest and dividends | 1,161 | 946 |
Equity Securities, Estimated Fair Value | 55,785 | 48,489 |
Commercial paper and money market funds | 21,714 | 32,787 |
Equity investments in unconsolidated affiliates, equity method | 5,629 | 5,847 |
Equity investments in unconsolidated affiliates, measurement alternative | 7,060 | 6,589 | $ 5,439
Assets, fair value disclosure | 135,341 | 113,352 |
Level 1 |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Cash and cash equivalents | 43,992 | 18,694 |
Accrued interest and dividends | 1,161 | 946 |
Equity Securities, Estimated Fair Value | 55,785 | 48,489 |
Commercial paper and money market funds | 21,714 | 32,787 |
Equity investments in unconsolidated affiliates, equity method | 0 | 0 |
Equity investments in unconsolidated affiliates, measurement alternative | 0 | 0 |
Assets, fair value disclosure | 122,652 | 100,916 |
Level 2 |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Cash and cash equivalents | 0 | 0 |
Accrued interest and dividends | 0 | 0 |
Equity Securities, Estimated Fair Value | 0 | 0 |
Commercial paper and money market funds | 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 and cash equivalents | 0 | 0 |
Accrued interest and dividends | 0 | 0 |
Equity Securities, Estimated Fair Value | 0 | 0 |
Commercial paper and money market funds | 0 | 0 |
Equity investments in unconsolidated affiliates, equity method | 5,629 | 5,847 |
Equity investments in unconsolidated affiliates, measurement alternative | 7,060 | 6,589 |
Assets, fair value disclosure | $ 12,689 | $ 12,436 |

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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=117815213&loc=d3e19207-110258 + Details
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