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Schedule I Summary of Investments-Other Than Investments in Related Parties (Details) $ in Thousands | Dec. 31, 2017 USD ($)
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Summary of Investments, Other than Investments in Related Parties, Reportable Data [Line Items] |
Cost | $ 7,901,923
Amount Shown in Balance Sheet | 8,352,348
Fixed maturity securities |
Summary of Investments, Other than Investments in Related Parties, Reportable Data [Line Items] |
Cost | 7,302,950
Fair Value | 7,724,075
Amount Shown in Balance Sheet | 7,724,075
Equity securities |
Summary of Investments, Other than Investments in Related Parties, Reportable Data [Line Items] |
Cost | 116,320
Fair Value | 135,466
Amount Shown in Balance Sheet | 135,466
U.S. Government and federally sponsored agency obligations | Fixed maturity securities |
Summary of Investments, Other than Investments in Related Parties, Reportable Data [Line Items] |
Cost | 1,131,962
Fair Value | 1,177,760
Amount Shown in Balance Sheet | 1,177,760
States, municipalities and political subdivisions | Fixed maturity securities |
Summary of Investments, Other than Investments in Related Parties, Reportable Data [Line Items] |
Cost | 1,711,581
Fair Value | 1,893,252
Amount Shown in Balance Sheet | 1,893,252
Foreign government bonds | Fixed maturity securities |
Summary of Investments, Other than Investments in Related Parties, Reportable Data [Line Items] |
Cost | 96,780
Fair Value | 102,738
Amount Shown in Balance Sheet | 102,738
Public utilities | Fixed maturity securities |
Summary of Investments, Other than Investments in Related Parties, Reportable Data [Line Items] |
Cost | 107,339
Fair Value | 125,201
Amount Shown in Balance Sheet | 125,201
All other corporate bonds | Fixed maturity securities |
Summary of Investments, Other than Investments in Related Parties, Reportable Data [Line Items] |
Cost | 2,284,448
Fair Value | 2,433,349
Amount Shown in Balance Sheet | 2,433,349
Asset-backed securities | Fixed maturity securities |
Summary of Investments, Other than Investments in Related Parties, Reportable Data [Line Items] |
Cost | 1,285,804
Fair Value | 1,301,634
Amount Shown in Balance Sheet | 1,301,634
Residential mortgage-backed securities (non-agency) | Fixed maturity securities |
Summary of Investments, Other than Investments in Related Parties, Reportable Data [Line Items] |
Cost | 86,741
Fair Value | 87,773
Amount Shown in Balance Sheet | 87,773
Commercial mortgage-backed securities | Fixed maturity securities |
Summary of Investments, Other than Investments in Related Parties, Reportable Data [Line Items] |
Cost | 580,655
Fair Value | 581,962
Amount Shown in Balance Sheet | 581,962
Redeemable preferred stocks | Fixed maturity securities |
Summary of Investments, Other than Investments in Related Parties, Reportable Data [Line Items] |
Cost | 17,640
Fair Value | 20,406
Amount Shown in Balance Sheet | 20,406
Industrial, miscellaneous and all other | Equity securities |
Summary of Investments, Other than Investments in Related Parties, Reportable Data [Line Items] |
Cost | 26,040
Fair Value | 34,623
Amount Shown in Balance Sheet | 34,623
Banking & finance and insurance companies | Equity securities |
Summary of Investments, Other than Investments in Related Parties, Reportable Data [Line Items] |
Cost | 10,601
Fair Value | 16,979
Amount Shown in Balance Sheet | 16,979
Public utilities | Equity securities |
Summary of Investments, Other than Investments in Related Parties, Reportable Data [Line Items] |
Cost | 1,104
Fair Value | 1,844
Amount Shown in Balance Sheet | 1,844
Non-redeemable preferred stocks | Equity securities |
Summary of Investments, Other than Investments in Related Parties, Reportable Data [Line Items] |
Cost | 58,571
Fair Value | 61,458
Amount Shown in Balance Sheet | 61,458
Closed-end fund | Equity securities |
Summary of Investments, Other than Investments in Related Parties, Reportable Data [Line Items] |
Cost | 20,004
Fair Value | 20,562
Amount Shown in Balance Sheet | 20,562
Short-term Investments |
Summary of Investments, Other than Investments in Related Parties, Reportable Data [Line Items] |
Cost | 62,593
Amount Shown in Balance Sheet | 62,593
Policy loans |
Summary of Investments, Other than Investments in Related Parties, Reportable Data [Line Items] |
Cost | 153,635
Amount Shown in Balance Sheet | 153,635
Derivative instruments |
Summary of Investments, Other than Investments in Related Parties, Reportable Data [Line Items] |
Cost | 5,396
Amount Shown in Balance Sheet | 15,550
Mortgage loans |
Summary of Investments, Other than Investments in Related Parties, Reportable Data [Line Items] |
Cost | 1,263
Amount Shown in Balance Sheet | 1,263
Other |
Summary of Investments, Other than Investments in Related Parties, Reportable Data [Line Items] |
Cost | 259,766
Amount Shown in Balance Sheet | $ 259,766

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- Definition This element represents the carrying (reported) amount of the entity's investments as of the balance sheet date. This amount may represent the individual investment's or group of similar investments' original cost, fair value, or such other amount at which the investment is shown in the entity's balance sheet. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 946 -SubTopic 320 -Section S99 -Paragraph 7 -Subparagraph (SX 210.12-15) -URI http://asc.fasb.org/extlink&oid=50485924&loc=d3e611379-123010 + Details
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