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Income Taxes (Details) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Sep. 30, 2018
Income tax provision (benefit) $ 1,040 $ 2,648 [1]  
Income tax expense (benefit) specific to the period $ (100) $ 2,800  
Tax Cuts and Jobs Act of 2017      
Income tax provision (benefit)     $ 3,000
[1] Prior period information has been restated for the adoption of ASU No. 2014-09, “Revenue from Contracts with Customers (Topic 606),” which we adopted on October 1, 2018.