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Fair Value Measurements (Carrying Amounts and Estimated Fair Values of Financial Instruments) (Parenthetical) (Details) $ in Thousands | Dec. 31, 2018 USD ($)
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Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items] |
Liabilities held for sale | $ 29,321
Deltic MDF Facility [Member] |
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items] |
Liabilities held for sale | 29,300
Deltic MDF Facility [Member] | Revenue bonds [Member] |
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items] |
Liabilities held for sale | $ 29,000

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- Details
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