Quarterly report pursuant to Section 13 or 15(d)

Income Tax Expense (Details)

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Income Tax Expense (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Mar. 31, 2019
Income Tax Disclosure [Abstract]          
Income tax expense (benefit) $ 11,203 $ 10,456 $ (16,457) $ 18,400  
Tax benefit connection with the reversal of substantially all of valuation allowance on net operating loss carryforwards         $ 35,700