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Schedule I Summary of Investments-Other Than Investments in Related Parties (Details) $ in Thousands | Dec. 31, 2016 USD ($)
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Summary of Investments, Other than Investments in Related Parties, Reportable Data [Line Items] |  |
Total investments, Cost | $ 7,687,155 | [1]
Total investments, Amount shown in Balance Sheet | 7,999,372 |
Fixed Maturities [Member] |  |
Summary of Investments, Other than Investments in Related Parties, Reportable Data [Line Items] |  |
Total investments, Cost | 7,152,127 | [1]
Total investments, Fair Value | 7,456,708 |
Total investments, Amount shown in Balance Sheet | 7,456,708 |
Equity Securities [Member] |  |
Summary of Investments, Other than Investments in Related Parties, Reportable Data [Line Items] |  |
Total investments, Cost | 134,013 | [1]
Total investments, Fair Value | 141,649 |
Total investments, Amount shown in Balance Sheet | 141,649 |
U.S. Government and federally sponsored agency obligations [Member] | Fixed Maturities [Member] |  |
Summary of Investments, Other than Investments in Related Parties, Reportable Data [Line Items] |  |
Total investments, Cost | 921,477 | [1]
Total investments, Fair Value | 946,268 |
Total investments, Amount shown in Balance Sheet | 946,268 |
States, municipalities and political subdivisions [Member] | Fixed Maturities [Member] |  |
Summary of Investments, Other than Investments in Related Parties, Reportable Data [Line Items] |  |
Total investments, Cost | 1,648,252 | [1]
Total investments, Fair Value | 1,769,398 |
Total investments, Amount shown in Balance Sheet | 1,769,398 |
Foreign government bonds [Member] | Fixed Maturities [Member] |  |
Summary of Investments, Other than Investments in Related Parties, Reportable Data [Line Items] |  |
Total investments, Cost | 93,864 | [1]
Total investments, Fair Value | 98,669 |
Total investments, Amount shown in Balance Sheet | 98,669 |
Public utilities [Member] | Fixed Maturities [Member] |  |
Summary of Investments, Other than Investments in Related Parties, Reportable Data [Line Items] |  |
Total investments, Cost | 140,893 | [1]
Total investments, Fair Value | 159,328 |
Total investments, Amount shown in Balance Sheet | 159,328 |
Other bonds [Member] | Fixed Maturities [Member] |  |
Summary of Investments, Other than Investments in Related Parties, Reportable Data [Line Items] |  |
Total investments, Cost | 4,347,641 | [1]
Total investments, Fair Value | 4,483,045 |
Total investments, Amount shown in Balance Sheet | 4,483,045 |
Non-redeemable Preferred Stock [Member] | Equity Securities [Member] |  |
Summary of Investments, Other than Investments in Related Parties, Reportable Data [Line Items] |  |
Total investments, Cost | 52,294 | [1]
Total investments, Fair Value | 50,048 |
Total investments, Amount shown in Balance Sheet | 50,048 |
Common Stocks [Member] | Equity Securities [Member] |  |
Summary of Investments, Other than Investments in Related Parties, Reportable Data [Line Items] |  |
Total investments, Cost | 61,715 | [1]
Total investments, Fair Value | 72,233 |
Total investments, Amount shown in Balance Sheet | 72,233 |
Closed-end fund [Member] | Equity Securities [Member] |  |
Summary of Investments, Other than Investments in Related Parties, Reportable Data [Line Items] |  |
Total investments, Cost | 20,004 | [1]
Total investments, Fair Value | 19,368 |
Total investments, Amount shown in Balance Sheet | 19,368 |
Short-term Investments [Member] |  |
Summary of Investments, Other than Investments in Related Parties, Reportable Data [Line Items] |  |
Total investments, Cost | 44,918 | [1]
Total investments, Amount shown in Balance Sheet | 44,918 |
Policy Loans [Member] |  |
Summary of Investments, Other than Investments in Related Parties, Reportable Data [Line Items] |  |
Total investments, Cost | 151,908 | [1]
Total investments, Amount shown in Balance Sheet | 151,908 |
Mortgages loan [Member] |  |
Summary of Investments, Other than Investments in Related Parties, Reportable Data [Line Items] |  |
Total investments, Cost | 57 | [1]
Total investments, Amount shown in Balance Sheet | 57 |
Derivative instruments [Member] |  |
Summary of Investments, Other than Investments in Related Parties, Reportable Data [Line Items] |  |
Total investments, Cost | 8,694 | [1]
Total investments, Amount shown in Balance Sheet | 8,694 |
Other [Member] |  |
Summary of Investments, Other than Investments in Related Parties, Reportable Data [Line Items] |  |
Total investments, Cost | 195,438 | [1]
Total investments, Amount shown in Balance Sheet | $ 195,438 |
[1] | Bonds at original cost reduced by repayments and adjusted for amortization of premiums or accrual of discounts and impairment in value of specifically identified investments.

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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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- Definition This item represents the original cost of the entity's investments including investments in equity securities and, as to fixed maturities, original cost reduced by repayments and adjusted for amortization of premiums or accrual of discounts. + 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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- Definition This item represents the reported amount of the entity's investments measured at fair value. Fair value is the price that would be received to sell an investment in an orderly transaction between market participants at the balance sheet [measurement] date. + 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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