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Investments (Net Realized Investment Gains (Losses)) (Details) $ in Thousands | 3 Months Ended |  |
--- | --- | --- | ---
Mar. 31, 2017 USD ($) | Mar. 31, 2016 USD ($) Issuer | Dec. 31, 2016 USD ($) | Dec. 31, 2015 USD ($)
Gain (Loss) on Investments [Line Items] |  |  |  |
OTTI losses | $ (419) | $ (10,734) |  |
Portion of OTTI losses recognized in other comprehensive income before taxes | 248 | 1,068 |  |
Net impairment losses recognized in earnings | (171) | (9,666) |  |
Gross realized gains, available-for-sale securities | 1,853 | 3,185 |  |
Gross realized (losses), available-for-sale securities | (67) | (4,647) |  |
Net realized gains (losses), trading securities | 6,562 | 2,055 |  |
Net realized gains (losses), Other investments | 1,172 | 52 |  |
Change in unrealized holding gains (losses), trading securities | 3,616 | 733 |  |
Change in unrealized holding gains (losses), convertible securities, carried at fair value | 313 | (66) |  |
Other | 2 | 2 |  |
Total net realized investment gains (losses) | 13,280 | (8,352) |  |
Credit-related other-than-temporary impairment recognized in earnings | 1,329 | 6,559 | $ 1,158 | $ 5,751
Corporate debt [Member] |  |  |  |
Gain (Loss) on Investments [Line Items] |  |  |  |
OTTI losses | (419) | (7,604) |  |
Portion of OTTI losses recognized in other comprehensive income before taxes | 248 | $ 1,068 |  |
Credit-related other-than-temporary impairment recognized in earnings |  |  | $ 5,500 |
Debt securities, number of issuers | Issuer |  | 10 |  |
Other investments [Member] |  |  |  |
Gain (Loss) on Investments [Line Items] |  |  |  |
OTTI losses | $ 0 | $ (3,130) |  |
Net impairment losses recognized in earnings |  | $ (3,100) |  |

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- Definition This item represents the gross profit realized on the sale of debt or equity securities categorized neither as held-to-maturity nor 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 (a) -URI http://asc.fasb.org/extlink&oid=73527792&loc=d3e27357-111563 + 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 The amount by which the fair value of an investment is less than the amortized cost basis or carrying amount of that investment at the balance sheet date and the decline in fair value is deemed to be other than temporary, before considering whether or not such amount is recognized in earnings or other comprehensive income. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=66902209&loc=d3e3602-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 35 -Paragraph 34 -URI http://asc.fasb.org/extlink&oid=27723805&loc=d3e25351-111560 + Details
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- Definition Amount before tax of other than temporary impairment loss (OTTI) on investments in available-for-sale and held-to-maturity debt securities, recognized in other comprehensive loss and attributable to parent entity. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 35 -Paragraph 35 -URI http://asc.fasb.org/extlink&oid=27723805&loc=d3e25362-111560 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 35 -Paragraph 34D -URI http://asc.fasb.org/extlink&oid=27723805&loc=SL6284304-111560 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 10A -Subparagraph (g) -URI http://asc.fasb.org/extlink&oid=66004124&loc=SL7669646-108580 + Details
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