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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, 2016 | Sep. 30, 2016 | Jun. 30, 2016 | Mar. 31, 2016 | Dec. 31, 2015 | Sep. 30, 2015 | Jun. 30, 2015 | Mar. 31, 2015 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Gain (Loss) on Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net realized and unrealized gains (losses) on investments | $ (49,967) | $ 59,870 | $ 69,772 | $ 61,653 | $ (42,817) | $ (41,138) | $ (26,712) | $ 41,749 | $ 141,328 | $ (68,918) | $ 41,433
Fixed maturity investments |  |  |  |  |  |  |  |  |  |  |
Gain (Loss) on Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |
Gross realized gains |  |  |  |  |  |  |  |  | 72,739 | 50,488 | 45,568
Gross realized losses |  |  |  |  |  |  |  |  | (38,315) | (53,630) | (14,868)
Net realized gains (losses) on fixed maturity investments |  |  |  |  |  |  |  |  | 34,424 | (3,142) | 30,700
Net unrealized gains (losses) on fixed maturity investments trading |  |  |  |  |  |  |  |  | 26,954 | (64,908) | 19,680
Net realized gains on equity investments trading |  |  |  |  |  |  |  |  | 34,424 | (3,142) | 30,700
Investments-related derivatives |  |  |  |  |  |  |  |  |  |  |
Gain (Loss) on Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net realized and unrealized (losses) gains on investments-related derivatives |  |  |  |  |  |  |  |  | (15,414) | 5,443 | (30,931)
Equity investments |  |  |  |  |  |  |  |  |  |  |
Gain (Loss) on Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net realized gains (losses) on fixed maturity investments |  |  |  |  |  |  |  |  | 14,190 | 16,348 | 10,908
Net unrealized gains (losses) on fixed maturity investments trading |  |  |  |  |  |  |  |  | 81,174 | (22,659) | 11,076
Net realized gains on equity investments trading |  |  |  |  |  |  |  |  | $ 14,190 | $ 16,348 | $ 10,908

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- Definition Amount of realized and unrealized gain (loss) of derivative instruments not designated or qualifying as hedging instruments and relating to the entity's investment portfolio. + References No definition available. + Details
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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=73527792&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=66902209&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=73527792&loc=d3e27405-111563 + Details
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- Definition This item represents the gain realized during the period from the sale of trading securities. + 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 (e) -URI http://asc.fasb.org/extlink&oid=73527792&loc=d3e27357-111563 Reference 2: 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)) -URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Trading Securities -URI http://asc.fasb.org/extlink&oid=6526789 + Details
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- Definition Amount of gain (loss) realized from securities classified as trading. + References Reference 1: 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)) -URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Trading Securities -URI http://asc.fasb.org/extlink&oid=6526789 + Details
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