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Fair Value Measurements (Assets and Liabilities Measured on Nonrecurring Basis) (Details) - Trade - Fair Value, Measurements, Recurring - Level 3 $ in Thousands | Dec. 31, 2019 USD ($)
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Implied based on market prices | Real propert |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
Asset fair value | $ 608
Valuation Technique, Discounted Cash Flow [Member] | Equity method investments |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
Asset fair value | 12,424
Valuation, Income Approach [Member] | Frac sand assets |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
Asset fair value | $ 16,546

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