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Summary of Significant Accounting Policies - Investment Contract and Life Policy Reserves (Details) - USD ($) $ in Thousands | Dec. 31, 2018 | Dec. 31, 2017
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Organization, Consolidation and Presentation of Financial Statements [Abstract] |  |
Investment contract reserves | $ 4,555,856 | $ 4,452,972
Life policy reserves | 1,155,337 | 1,120,763
Total | $ 5,711,193 | $ 5,573,735

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- Definition Amount of accrued obligation to policyholders that relates to insured events under individual and group annuities and supplementary insurance contracts. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 40 -Section 25 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=28366191&loc=d3e13145-158430 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03.13(a)(1)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 + Details
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