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Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2019 | Dec. 31, 2018
Fixed maturities - available for sale, at market value, amortized cost | $ 15,440,999 | $ 15,406,572
Short-term investments, at cost | 597,107 | 241,010
Other invested assets, at cost | $ 1,644,004 | $ 1,591,745
Preferred shares, par value | $ 0.01 | $ 0.01
Preferred shares, authorized | 50,000,000 | 50,000,000
Preferred shares, issued | 0 | 0
Preferred shares, outstanding | 0 | 0
Common shares, par value | $ 0.01 | $ 0.01
Common shares, authorized | 200,000,000 | 200,000,000
Common shares, outstanding | 69,396,000 | 69,202,000
Accumulated other comprehensive income (loss), net of deferred income tax expense (benefit) | $ 4,562 | $ (20,697)
Treasury shares | 28,626,000 | 28,551,000
4.868% Senior notes due 6/1/2044 [Member] | Senior Notes [Member] |  |
Debt instrument, maturity date | Jun. 01, 2044 |
6.6 % Long Term Subordinated Notes [Member] | Subordinated Debt [Member] |  |
Debt instrument, maturity date | May 01, 2067 |

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