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Fair Value Measurements (Carrying Amounts and Estimated Fair Values of Financial Instruments) (Parenthetical) (Details) $ in Thousands	Dec. 31, 2018 USD ($)
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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- Definition

Liabilities held for sale not part of disposal group current.

+ References

No definition available.

+ Details

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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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- Details

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