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Regulatory Information - Schedule of Statutory Surplus, Contingency Reserve and RTC Ratio (Details) - Combined
$ in Thousands
Jun. 30, 2019
USD ($)
Mar. 31, 2019
Dec. 31, 2018
USD ($)
Statutory Accounting Practices [Line Items]      
Statutory surplus $ 438,397   $ 430,785
Contingency reserve $ 423,413   $ 332,702
RTC Ratio   15.8 13.1