General form of registration statement for all companies including face-amount certificate companies

Income Taxes - Schedule of Effective Income Tax Reconciliation (Details)

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Income Taxes - Schedule of Effective Income Tax Reconciliation (Details) - USD ($)
$ in Thousands
1 Months Ended 2 Months Ended 3 Months Ended 8 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2019
Aug. 31, 2019
Sep. 30, 2018
Aug. 31, 2019
Sep. 30, 2018
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Income Tax Disclosure [Abstract]                
Computed expected tax benefit           $ (144,963) $ (39,616) $ (24,206)
Change in valuation allowance affecting income tax expense           52,916 39,499 26,892
Goodwill impairment not resulting in tax impact           78,869 0 0
Other expense (income) not resulting in tax impact           568 1,211 (1,585)
Tax amortization of indefinite-lived assets           0 4,001 4,000
2017 Federal tax reform enactment             (9,020)  
State and local income taxes, net of federal income taxes           1,058 2,032 2,047
Total Income tax expense (benefit) $ 204 $ 438 $ 1,346 $ 1,775 $ 4,039 $ (11,552) $ (1,893) $ 7,148