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Income Taxes (Details) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Dec. 31, 2019
Income Taxes [Line Items]      
Reasonably possible recognition of income tax benefit (in excess of) $ 9,911 $ 17,982  
Scenario, Forecast      
Income Taxes [Line Items]      
Reasonably possible recognition of income tax benefit (in excess of)     $ 500,000