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Investments (Other Invested Assets) (Details) - USD ($) $ in Thousands | Jun. 30, 2015 | Dec. 31, 2014
--- | --- | ---
Other Investments [Line Items] |  |
Other invested assets | $ 1,110,107 | $ 1,198,319
Equity securities |  |
Other Investments [Line Items] |  |
Other invested assets | 127,668 | 126,860
Limited Partner [Member] |  |
Other Investments [Line Items] |  |
Other invested assets | 492,465 | 446,604
Structured loans |  |
Other Investments [Line Items] |  |
Other invested assets | 52,185 | 164,309
Derivatives |  |
Other Investments [Line Items] |  |
Other invested assets | 194,276 | 216,966
Fair Value Option Contractholder Directed Unit Linked Investments [Member] |  |
Other Investments [Line Items] |  |
Other invested assets | 137,529 | 140,344
Other |  |
Other Investments [Line Items] |  |
Other invested assets | $ 105,984 | $ 103,236

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