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Investments (Other Invested Assets) (Details) - USD ($) $ in Thousands | Dec. 31, 2015 | Dec. 31, 2014
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Other Investments [Abstract] |  |
Other invested assets | $ 1,298,120 | $ 1,198,319
Equity Securities [Member] |  |
Other Investments [Abstract] |  |
Other invested assets | 125,862 | 126,860
Limited Partner [Member] |  |
Other Investments [Abstract] |  |
Other invested assets | 567,697 | 446,604
Secured Debt [Member] |  |
Other Investments [Abstract] |  |
Other invested assets | 45,422 | 164,309
Gain (Loss) on Derivatives [Member] |  |
Other Investments [Abstract] |  |
Other invested assets | 256,178 | 216,966
Fair Value Option Contractholder Directed Unit Linked Investments [Member] |  |
Other Investments [Abstract] |  |
Other invested assets | 197,547 | 140,344
Other [Member] |  |
Other Investments [Abstract] |  |
Other invested assets | $ 105,414 | $ 103,236

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- Definition Other investments not otherwise specified in the taxonomy. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.12) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03.1(f,g)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 + Details
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