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Fair Value Measurements (Summarized Information About Level 3 Fair Value Measurements) (Details) - Level 3 - USD ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | --- | ---
Convertible Preferred Securities |  |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] (Deprecated 2018-01-31) |  |  |
Assets, fair value measurement with unobservable input | $ 8,849 | $ 8,404 | $ 7,154
Recurring | Convertible Preferred Securities | Market approach |  |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] (Deprecated 2018-01-31) |  |  |
Assets, fair value measurement with unobservable input | $ 8,849 | 8,404 |
Nonrecurring | Trade | Frac Sand Assets [Member] | Third party appraisal |  |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] (Deprecated 2018-01-31) |  |  |
Assets, fair value measurement with unobservable input |  | 16,546 |
Nonrecurring | Trade | Real Property | Market approach |  |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] (Deprecated 2018-01-31) |  |  |
Assets, fair value measurement with unobservable input |  | 608 |
Nonrecurring | Trade | Equity Method Investments [Member] | Discounted cash flow analysis |  |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] (Deprecated 2018-01-31) |  |  |
Assets, fair value measurement with unobservable input |  | $ 12,424 |

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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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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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