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Income Taxes (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Income Taxes [Abstract]        
Income tax expense (benefit) $ (6,927) $ 358 $ 24,119 $ 372