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

Summary of Significant Accounting Policies - Roll Forward of Receivable Allowance (Details)

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Summary of Significant Accounting Policies - Roll Forward of Receivable Allowance (Details) - USD ($)
$ in Thousands
1 Months Ended 8 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2019
Aug. 31, 2019
Sep. 30, 2018
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Allowance for Doubtful Accounts Receivable [Roll Forward]            
Balance Beginning of Year   $ 3,759 $ 4,162 $ 4,162 $ 3,043 $ 2,762
Charged to Expense $ 912 $ 7,558 $ 8,511 12,300 11,014 10,785
Write-Offs and Other       (12,703) (9,895) (10,504)
Balance End of Year       $ 3,759 $ 4,162 $ 3,043