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Investments - Schedule of Maturities of Fixed Maturity Securities Available-for-Sale (Details) - USD ($) $ in Thousands | Dec. 31, 2016 | Dec. 31, 2015
--- | --- | ---
Amortized Cost |  |
Total | $ 1,258,419 |
Fair Value |  |
Total | 1,278,958 | $ 1,231,841
Corporate, Municipal, U.S. Government and Other securities |  |
Amortized Cost |  |
Due in one year or less | 48,194 |
Due after one year through five years | 113,158 |
Due after five years through ten years | 137,763 |
Due after ten years | 698,160 |
Subtotal | 997,275 |
Fair Value |  |
Due in one year or less | 44,237 |
Due after one year through five years | 113,987 |
Due after five years through ten years | 139,539 |
Due after ten years | 716,281 |
Subtotal | 1,014,044 |
Mortgage-backed securities |  |
Amortized Cost |  |
Amortized cost, without single maturity date | 184,841 |
Fair Value |  |
Fair value, without single maturity date | 187,249 |
Asset-backed securities |  |
Amortized Cost |  |
Amortized cost, without single maturity date | 76,303 |
Fair Value |  |
Fair value, without single maturity date | $ 77,665 |

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- Definition Amount after adjustments of available-for-sale debt securities at cost, maturing in the sixth fiscal year through the tenth fiscal year following the latest fiscal year. Adjustments include, but are not limited to, accretion, amortization, collection of cash, previous other-than-temporary impairments (OTTI) recognized in earnings less cumulative-effect adjustments, and fair value hedge accounting adjustments. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.2) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27198-111563 + Details
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- Definition Amount after adjustments of available-for-sale debt securities at cost, maturing in the second fiscal year through the fifth fiscal year following the latest fiscal year. Adjustments include, but are not limited to, accretion, amortization, collection of cash, previous other-than-temporary impairments (OTTI) recognized in earnings less cumulative-effect adjustments, and fair value hedge accounting adjustments. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.2) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27198-111563 + Details
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