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Income Taxes (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Income Taxes [Abstract]        
Income tax expense (benefit) $ (14,915) $ 452 $ 9,204 $ 824