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Investments - Net Investment Income (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2020 | Sep. 30, 2019 | Sep. 30, 2020 | Sep. 30, 2019
Net Investment Income [Line Items] |  |  |  |
Investment expenses | $ (2,151) | $ (2,179) | $ (7,262) | $ (7,420)
Total net investment income | 93,718 | 93,071 | 256,403 | 279,329
Investment Portfolio |  |  |  |
Net Investment Income [Line Items] |  |  |  |
Total net investment income | 69,219 | 69,313 | 184,262 | 232,376
Deposit asset on reinsurance |  |  |  |
Net Investment Income [Line Items] |  |  |  |
Total net investment income | 24,499 | 23,758 | 72,141 | 46,953
Fixed maturity securities |  |  |  |
Net Investment Income [Line Items] |  |  |  |
Net investment income - investment portfolio | 56,420 | 59,319 | 174,727 | 227,196
Equity securities |  |  |  |
Net Investment Income [Line Items] |  |  |  |
Net investment income - investment portfolio | 1,130 | 1,107 | 3,520 | 3,697
Limited partnership interests |  |  |  |
Net Investment Income [Line Items] |  |  |  |
Net investment income - investment portfolio | 11,046 | 6,859 | 4,862 | 22,759
Short-term and other investments |  |  |  |
Net Investment Income [Line Items] |  |  |  |
Net investment income - investment portfolio | $ 2,774 | $ 4,207 | $ 8,415 | $ (13,856)

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- Definition Represents the total of interest and dividend income, including any amortization and accretion (as applicable) of discounts and premiums, earned from (1) loans and leases whether held-for-sale or held-in-portfolio; (2) investment securities; (3) federal funds sold; (4) securities purchased under agreements to resell; (5) investments in banker's acceptances, commercial paper, or certificates of deposit; (6) dividend income; or (7) other investments not otherwise specified herein. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 220 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-04.1-5) -URI http://asc.fasb.org/extlink&oid=120399700&loc=SL114874048-224260 + Details
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- Definition Amount of expenses related to the generation of investment income. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.9) -URI http://asc.fasb.org/extlink&oid=120395209&loc=SL114868664-224227 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 220 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-04.2) -URI http://asc.fasb.org/extlink&oid=120400993&loc=SL114874131-224263 + Details
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- Definition Amount, after investment expense, of income earned from investments in securities and real estate. Includes, but is not limited to, real estate investment, policy loans, dividends, and interest. Excludes realized gain (loss) on investments. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 220 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-04(2)) -URI http://asc.fasb.org/extlink&oid=120400993&loc=SL114874131-224263 + Details
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