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CONSOLIDATED BALANCE SHEETS (Parenthetical) - USD ($) shares in Thousands, $ in Thousands | Dec. 31, 2019 | Dec. 31, 2018
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Statement of Financial Position [Abstract] |  |
Fixed maturities, available for sale, amortized cost | $ 12,263,240 | $ 11,616,312
Cost | $ 398,956 | $ 365,905
Common shares, shares issued (in shares) | 176,580 | 176,580
Common shares, shares outstanding (in shares) | 83,959 | 83,586
Treasury shares (in shares) | 92,621 | 92,994

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- Definition Amortized cost of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=118939692&loc=d3e27161-111563 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 30 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=118942338&loc=SL82898722-210454 + Details
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