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Income Taxes (Narrative) (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2020
Mar. 31, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Income Taxes [Line Items]          
Income tax (benefit) expense $ 16,840   $ 1,221 $ 6,431 $ 1,860
Pension settlement charge   $ 43,000   42,988  
Pension Plans [Member]          
Income Taxes [Line Items]          
Income tax (benefit) expense       $ (11,200)  
Increase in deferred tax assets   6,800      
Remeasurement of pension plan obligations   $ 26,200      
Deltic MDF Facility [Member]          
Income Taxes [Line Items]          
Reduction to deferred tax liabilities         (15,800)
Increase to income taxes payable         $ 15,800