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Investments (Fair Value Below Amortized Cost of Gross Unrealized Losses for Fixed Maturity and Equity Securities) (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2015 | Dec. 31, 2014
Gross unrealized losses with number of securities [Line Items] |  |
Available-for-sale Securities, Gross Unrealized Losses | $ 627,451 | $ 134,919
Percentage Of Total Gross Unrealized Losses | 100.00% | 100.00%
Less Than 20 Percent [Member] |  |
Gross unrealized losses with number of securities [Line Items] |  |
Available-for-sale Securities, Gross Unrealized Losses | $ 463,109 | $ 111,965
Percentage Of Total Gross Unrealized Losses | 73.80% | 83.00%
More Than Or Equal To 20 Percent For Less Than Six Months [Member] |  |
Gross unrealized losses with number of securities [Line Items] |  |
Available-for-sale Securities, Gross Unrealized Losses | $ 142,495 | $ 13,698
Percentage Of Total Gross Unrealized Losses | 22.70% | 10.10%
More Than Or Equal To 20 Percent For Six Months Or Greater [Member] |  |
Gross unrealized losses with number of securities [Line Items] |  |
Available-for-sale Securities, Gross Unrealized Losses | $ 21,847 | $ 9,256
Percentage Of Total Gross Unrealized Losses | 3.50% | 6.90%

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- Definition Amount of unrealized loss before deducting unrealized gain on investments in available-for-sale securities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27161-111563 + Details
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