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Business Combinations - Expected Amortization (Details) - Ozark National Life Insurance Company
$ in Thousands
Jan. 31, 2019
USD ($)
Acquired Indefinite-lived Intangible Assets [Line Items]  
Remainder of 2019 $ 1,961
2020 7,446
2021 7,068
2022 6,739
2023 $ 6,445