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Schedule I Summary of Investments - Other Than Investments in Related Parties (Details) $ in Thousands	Dec. 31, 2018 USD ($)
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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Amount of investment held by insurance company, excluding investment in related party.

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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 946
-SubTopic 320
-Section S99
-Paragraph 7
-Subparagraph (SX 210.12-15(Column D))
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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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-Name Accounting Standards Codification
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-SubTopic 320
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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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-Name Accounting Standards Codification
-Topic 946
-SubTopic 320
-Section S99
-Paragraph 7
-Subparagraph (SX 210.12-15(Column C))
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