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Investments, Securities with Continuous Unrealized Loss Position (Details) - USD ($) $ in Thousands | Dec. 31, 2016 | Dec. 31, 2015
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Available-for-sale securities, continuous unrealized loss position, Fair Value [Abstract] |  |
Less than 12 months | $ 91,645 | $ 104,770
12 months or longer | 20,587 | 18,374
Total Fair Value | 112,232 | 123,144
Available-for-sale securities, continuous unrealized loss position, Unrealized Losses [Abstract] |  |
Less than 12 months | 2,985 | 4,956
12 months or longer | 2,556 | 5,103
Total Unrealized Losses | 5,541 | 10,059
Fixed Maturities - U.S. Treasury Securities and Obligations of U.S. Government Agencies and Authorities [Member] |  |
Available-for-sale securities, continuous unrealized loss position, Fair Value [Abstract] |  |
Less than 12 months | 23,494 | 9,209
12 months or longer | 0 | 2,243
Total Fair Value | 23,494 | 11,452
Available-for-sale securities, continuous unrealized loss position, Unrealized Losses [Abstract] |  |
Less than 12 months | 553 | 120
12 months or longer | 0 | 55
Total Unrealized Losses | 553 | 175
Fixed Maturities - Obligations of States and Political Subdivisions [Member] |  |
Available-for-sale securities, continuous unrealized loss position, Fair Value [Abstract] |  |
Less than 12 months | 8,747 | 16,079
12 months or longer | 0 | 0
Total Fair Value | 8,747 | 16,079
Available-for-sale securities, continuous unrealized loss position, Unrealized Losses [Abstract] |  |
Less than 12 months | 308 | 552
12 months or longer | 0 | 0
Total Unrealized Losses | 308 | 552
Fixed Maturities - Corporate Securities [Member] |  |
Available-for-sale securities, continuous unrealized loss position, Fair Value [Abstract] |  |
Less than 12 months | 59,404 | 79,482
12 months or longer | 20,587 | 16,131
Total Fair Value | 79,991 | 95,613
Available-for-sale securities, continuous unrealized loss position, Unrealized Losses [Abstract] |  |
Less than 12 months | 2,124 | 4,284
12 months or longer | 2,556 | 5,048
Total Unrealized Losses | $ 4,680 | $ 9,332

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- Definition Amount of accumulated unrealized loss on investments in debt and equity securities classified as available-for-sale that have been in a continuous loss position for twelve months or longer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 6 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=73527792&loc=d3e27290-111563 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=73527792&loc=d3e27337-111563 + Details
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- Definition Amount of accumulated unrealized loss on investments in debt and equity securities classified as available-for-sale in a continuous loss position. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=73527792&loc=d3e27337-111563 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 6 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=73527792&loc=d3e27290-111563 + Details
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- Definition This item represents the aggregate fair value of investments in debt and equity securities in an unrealized loss position which are categorized neither as held-to-maturity nor trading securities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 6 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=73527792&loc=d3e27290-111563 + Details
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- Definition Amount of accumulated unrealized loss on investments in debt and equity securities classified as available-for-sale that have been in a continuous loss position for less than twelve months. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 6 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=73527792&loc=d3e27290-111563 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=73527792&loc=d3e27337-111563 + Details
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