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Derivative Instruments (Narrative) (Details) (USD $) | Sep. 30, 2014 | Dec. 31, 2013
--- | --- | ---
Derivative [Line Items] |  |  |  |
Derivative Asset | $ 8,741,000 |  | $ 10,667,000 |
Interest Rate Contracts | Long |  |  |  |
Derivative [Line Items] |  |  |  |
Derivative, Notional Amount | 493,900,000 |  | 1,169,300,000 |
Interest Rate Contracts | Short |  |  |  |
Derivative [Line Items] |  |  |  |
Derivative, Notional Amount | 566,600,000 |  | 356,600,000 |
Foreign Currency Forward Contracts, Underwriting and Non-investment Operations | Long |  |  |  |
Derivative [Line Items] |  |  |  |
Derivative, Notional Amount | 154,800,000 |  | 263,600,000 |
Foreign Currency Forward Contracts, Underwriting and Non-investment Operations | Short |  |  |  |
Derivative [Line Items] |  |  |  |
Derivative, Notional Amount | 193,100,000 |  | 139,800,000 |
Foreign Currency Forward Contracts, Investment Operations | Long |  |  |  |
Derivative [Line Items] |  |  |  |
Derivative, Notional Amount | 29,900,000 |  | 39,600,000 |
Foreign Currency Forward Contracts, Investment Operations | Short |  |  |  |
Derivative [Line Items] |  |  |  |
Derivative, Notional Amount | 150,000,000 |  | 159,100,000 |
Credit Default Swaps | Long |  |  |  |
Derivative [Line Items] |  |  |  |
Derivative, Notional Amount | 5,000,000 |  | 7,100,000 |
Credit Default Swaps | Short |  |  |  |
Derivative [Line Items] |  |  |  |
Derivative, Notional Amount | 27,400,000 |  | 18,400,000 |
Weather Contract | Short |  |  |  |
Derivative [Line Items] |  |  |  |
Derivative, Notional Amount | 2,300,000 |  | 6,400,000 |
Other Assets [Member] | Interest Rate Contracts |  |  |  |
Derivative [Line Items] |  |  |  |
Derivative Asset | 482,000 |  | 835,000 |
Other Assets [Member] | Foreign Currency Forward Contracts, Underwriting and Non-investment Operations |  |  |  |
Derivative [Line Items] |  |  |  |
Derivative Asset | 5,930,000 | [1] | 8,433,000 | [1]
Other Assets [Member] | Foreign Currency Forward Contracts, Investment Operations |  |  |  |
Derivative [Line Items] |  |  |  |
Derivative Asset | 1,462,000 | [2] | 675,000 | [2]
Other Assets [Member] | Credit Default Swaps |  |  |  |
Derivative [Line Items] |  |  |  |
Derivative Asset | 603,000 |  | 724,000 |
Other Assets [Member] | Call Rights |  |  |  |
Derivative [Line Items] |  |  |  |
Derivative Asset | $ 264,000 |  |  |
[1] | Contracts used to manage foreign currency risks in underwriting and non-investment operations.
[2] | Contracts used to manage foreign currency risks in investment operations.

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- Definition Aggregate notional amount specified by the derivative(s). Expressed as an absolute value. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Article 12 -Section 13 -Sentence Column B + Details
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