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Derivative Instruments (Narrative) (Details) - USD ($) $ in Thousands | Jun. 30, 2015 | Dec. 31, 2014 | Jun. 30, 2014
--- | --- | --- | ---
Other Assets |  |  |
Derivative [Line Items] |  |  |
Derivative Asset | $ 1,911 | $ 7,694 |
Interest Rate Contracts | Other Assets |  |  |
Derivative [Line Items] |  |  |
Derivative Asset | 106 | 0 |
Interest Rate Contracts | Long |  |  |
Derivative [Line Items] |  |  |
Derivative, Notional Amount | 1,355,900 | 587,000 |
Interest Rate Contracts | Short |  |  |
Derivative [Line Items] |  |  |
Derivative, Notional Amount | 1,414,000 | 617,400 |
Foreign Currency Forward Contracts, Underwriting and Non-investment Operations | Other Assets |  |  |
Derivative [Line Items] |  |  |
Derivative Asset | 1,020 | 4,003 |
Foreign Currency Forward Contracts, Underwriting and Non-investment Operations | Long |  |  |
Derivative [Line Items] |  |  |
Derivative, Notional Amount | 162,400 | 144,800 |
Foreign Currency Forward Contracts, Underwriting and Non-investment Operations | Short |  |  |
Derivative [Line Items] |  |  |
Derivative, Notional Amount | 126,200 | 121,600 |
Foreign Currency Forward Contracts, Investment Operations | Other Assets |  |  |
Derivative [Line Items] |  |  |
Derivative Asset | 646 | 3,311 |
Foreign Currency Forward Contracts, Investment Operations | Long |  |  |
Derivative [Line Items] |  |  |
Derivative, Notional Amount | 32,200 | 35,800 |
Foreign Currency Forward Contracts, Investment Operations | Short |  |  |
Derivative [Line Items] |  |  |
Derivative, Notional Amount | 127,300 | 150,100 |
Credit Default Swaps | Other Assets |  |  |
Derivative [Line Items] |  |  |
Derivative Asset | 139 | 380 |
Credit Default Swaps | Long |  |  |
Derivative [Line Items] |  |  |
Derivative, Notional Amount | 0 | 4,600 |
Credit Default Swaps | Short |  |  |
Derivative [Line Items] |  |  |
Derivative, Notional Amount | 32,700 | 19,400 |
Weather contract | Short |  |  |
Derivative [Line Items] |  |  |
Derivative, Notional Amount | $ 2,100 | $ 2,200 |
Call Rights | Other Assets |  |  |
Derivative [Line Items] |  |  |
Derivative Asset |  |  | $ 2,220

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