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CONSOLIDATED BALANCE SHEETS (Parenthetical) - USD ($) shares in Thousands, $ in Thousands | Sep. 30, 2019 | Jun. 30, 2019 | Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Dec. 31, 2017
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Statement of Financial Position [Abstract] |  |  |  |  |  |
Fixed maturities, available for sale, amortized cost | $ 12,407,704 |  | $ 11,616,312 |  |  |
Equity securities, cost | $ 380,645 |  | $ 365,905 |  |  |
Common shares, shares issued (in shares) | 176,580 | 176,580 | 176,580 | 176,580 | 176,580 | 176,580
Common shares, shares outstanding (in shares) | 83,947 |  | 83,586 | 83,557 |  |
Treasury shares, shares (in shares) | 92,633 | 92,633 | 92,994 | 93,023 | 93,024 | 93,419

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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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