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Income Taxes (Details) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Sep. 30, 2019
Sep. 30, 2018
Jan. 31, 2020
Income Taxes [Line Items]          
Effective Tax Rate 26.60% 18.20%      
Reversal of Estimate for Potential Sequestration of AMT Credit Refunds     $ 5,000    
Reduction to Income Tax Expense Due to Remeasurement of Deferred Income Tax Assets and Liabilities       $ 5,000  
Alternative Minimum Tax Credit [Member]          
Income Taxes [Line Items]          
Tax Credit Carryforwards       $ 85,000  
Subsequent Event [Member]          
Income Taxes [Line Items]          
AMT Credit Refund Received         $ 42,500
Federal [Member] | Other Noncurrent Assets [Member]          
Income Taxes [Line Items]          
Income Taxes Receivable $ 21,273 $ 42,100 $ 0