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Fair Value Measurements (Reconciliation of Beginning and Ending Balances of Level 3 Measurements) (Details) - Level 3 - USD ($) $ in Thousands | 3 Months Ended |
--- | --- | ---
Jun. 30, 2019 | Mar. 31, 2019 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2018
Convertible preferred securities |  |  |  |  |
Reconciliation of Fair Value Measurements Using Level 3 |  |  |  |  |
Asset (liability), Beginning Balance | $ 7,404 | $ 7,154 | $ 7,388 | $ 7,388 |
Additional investments | 1,000 | 250 | 100 | 0 |
Asset (liability), Ending Balance | 8,404 | $ 7,404 | 7,488 | $ 7,388 |
Convertible preferred securities | Implied based on market prices |  |  |  |  |
Quantitative Information about Level 3 Fair Value Measurements |  |  |  |  |
Asset fair value | 8,404 |  | 7,488 |  | $ 7,154
Real Property | Market Approach | Rail |  |  |  |  |
Quantitative Information about Level 3 Fair Value Measurements |  |  |  |  |
Asset fair value | $ 2,719 |  |  |  |
Real Property | Sale agreement |  |  |  |  |
Quantitative Information about Level 3 Fair Value Measurements |  |  |  |  |
Asset fair value |  |  | 1,300 |  |
Real Property | National scrap index less cost to sell | Rail |  |  |  |  |
Quantitative Information about Level 3 Fair Value Measurements |  |  |  |  |
Asset fair value |  |  | $ 4,063 |  |

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- Definition Fair value of financial instrument classified as an asset measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing. + 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 (c) -URI http://asc.fasb.org/extlink&oid=117815213&loc=d3e19207-110258 + Details
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