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Schedule I Summary of Investments - Other Than Investments in Related Parties (Details) $ in Thousands | Dec. 31, 2018 USD ($)
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Summary of Investments Other Than Investments In Related Parties |
Summary of investments, other than investments in related parties, cost | $ 3,137,478
Summary of investments, other than investments in related parties, fair value | 3,105,927
Summary of investments, other than investments in related parties, carrying amount | 3,130,986
US Government and Government Agencies and Authorities [Member] |
Summary of Investments Other Than Investments In Related Parties |
Summary of investments, other than investments in related parties, cost | 218,267
Summary of investments, other than investments in related parties, fair value | 218,773
Summary of investments, other than investments in related parties, carrying amount | 218,773
US States and Political Subdivisions Debt Securities [Member] |
Summary of Investments Other Than Investments In Related Parties |
Summary of investments, other than investments in related parties, cost | 59,075
Summary of investments, other than investments in related parties, fair value | 60,006
Summary of investments, other than investments in related parties, carrying amount | 60,006
Foreign Government Debt [Member] |
Summary of Investments Other Than Investments In Related Parties |
Summary of investments, other than investments in related parties, cost | 155,723
Summary of investments, other than investments in related parties, fair value | 158,112
Summary of investments, other than investments in related parties, carrying amount | 158,112
All Other Corporate Bonds [Member] |
Summary of Investments Other Than Investments In Related Parties |
Summary of investments, other than investments in related parties, cost | 2,626,797
Summary of investments, other than investments in related parties, fair value | 2,588,816
Summary of investments, other than investments in related parties, carrying amount | 2,613,875
Mandatorily Redeemable Preferred Stock [Member] |
Summary of Investments Other Than Investments In Related Parties |
Summary of investments, other than investments in related parties, cost | 2,947
Summary of investments, other than investments in related parties, fair value | 2,869
Summary of investments, other than investments in related parties, carrying amount | 2,869
Fixed Maturities [Member] |
Summary of Investments Other Than Investments In Related Parties |
Summary of investments, other than investments in related parties, cost | 3,062,809
Summary of investments, other than investments in related parties, fair value | 3,028,576
Summary of investments, other than investments in related parties, carrying amount | 3,053,635
Public Utility, Equities [Member] |
Summary of Investments Other Than Investments In Related Parties |
Summary of investments, other than investments in related parties, cost | 6,469
Summary of investments, other than investments in related parties, fair value | 9,491
Summary of investments, other than investments in related parties, carrying amount | 9,491
Banks, Trust and Insurance, Equities [Member] |
Summary of Investments Other Than Investments In Related Parties |
Summary of investments, other than investments in related parties, cost | 20,184
Summary of investments, other than investments in related parties, fair value | 18,901
Summary of investments, other than investments in related parties, carrying amount | 18,901
Industrial, Miscellaneous, and All Others [Member] |
Summary of Investments Other Than Investments In Related Parties |
Summary of investments, other than investments in related parties, cost | 4,869
Summary of investments, other than investments in related parties, fair value | 6,763
Summary of investments, other than investments in related parties, carrying amount | 6,763
Nonredeemable Preferred Stock [Member] |
Summary of Investments Other Than Investments In Related Parties |
Summary of investments, other than investments in related parties, cost | 3,475
Summary of investments, other than investments in related parties, fair value | 2,524
Summary of investments, other than investments in related parties, carrying amount | 2,524
Equity Securities, Investment Summary [Member] |
Summary of Investments Other Than Investments In Related Parties |
Summary of investments, other than investments in related parties, cost | 34,997
Summary of investments, other than investments in related parties, fair value | 37,679
Summary of investments, other than investments in related parties, carrying amount | 37,679
Policy Loans [Member] |
Summary of Investments Other Than Investments In Related Parties |
Summary of investments, other than investments in related parties, cost | 31,501
Summary of investments, other than investments in related parties, fair value | 31,501
Summary of investments, other than investments in related parties, carrying amount | 31,501
Short-term Investments [Member] |
Summary of Investments Other Than Investments In Related Parties |
Summary of investments, other than investments in related parties, cost | 8,171
Summary of investments, other than investments in related parties, fair value | 8,171
Summary of investments, other than investments in related parties, carrying amount | $ 8,171

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