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Investments (Schedule of Net Realized and Unrealized Gains on Investments and Net Other-Than-Temporary Impairments) (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2016 | Sep. 30, 2016 | Jun. 30, 2016 | Mar. 31, 2016 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Gain (Loss) on Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net realized and unrealized gains (losses) on investments | $ (7,716) | $ 42,052 | $ 58,113 | $ 43,373 | $ (49,967) | $ 59,870 | $ 69,772 | $ 61,653 | $ 135,822 | $ 141,328 | $ (68,918)
Fixed maturity investments |  |  |  |  |  |  |  |  |  |  |
Gain (Loss) on Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |
Gross realized gains |  |  |  |  |  |  |  |  | 49,121 | 72,739 | 50,488
Gross realized losses |  |  |  |  |  |  |  |  | (38,832) | (38,315) | (53,630)
Net realized gains (losses) on fixed maturity investments |  |  |  |  |  |  |  |  | 10,289 | 34,424 | (3,142)
Net unrealized gains (losses) on fixed maturity and equity investments trading |  |  |  |  |  |  |  |  | 8,479 | 26,954 | (64,908)
Net realized gains on equity investments trading |  |  |  |  |  |  |  |  | 10,289 | 34,424 | (3,142)
Investments-related derivatives |  |  |  |  |  |  |  |  |  |  |
Gain (Loss) on Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net realized and unrealized (losses) gains on investments-related derivatives |  |  |  |  |  |  |  |  | (2,490) | (15,414) | 5,443
Equity investments |  |  |  |  |  |  |  |  |  |  |
Gain (Loss) on Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net realized gains (losses) on fixed maturity investments |  |  |  |  |  |  |  |  | 80,027 | 14,190 | 16,348
Net unrealized gains (losses) on fixed maturity and equity investments trading |  |  |  |  |  |  |  |  | 39,517 | 81,174 | (22,659)
Net realized gains on equity investments trading |  |  |  |  |  |  |  |  | $ 80,027 | $ 14,190 | $ 16,348

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- Definition This item represents the net total realized and unrealized gain (loss) included in earnings for the period as a result of selling or holding marketable securities categorized as trading, available-for-sale, or held-to-maturity, including the unrealized holding gain (loss) of held-to-maturity securities transferred to the trading security category and the cumulative unrealized gain (loss) which was included in other comprehensive income (a separate component of shareholders' equity) for available-for-sale securities transferred to trading securities during the period. Additionally, this item would include any gains (losses) realized during the period from the sale of investments accounted for under the cost method of accounting and losses recognized for other than temporary impairments (OTTI) of the subject investments. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 9 -Subparagraph (c)-(e) -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27357-111563 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3602-108585 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.7(c),9(a)) -URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 10 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27405-111563 + Details
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