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Investments (Narrative) (Details)
$ in Thousands
9 Months Ended
Sep. 30, 2015
USD ($)
Other invested assets - other private securities [Member]  
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]  
Other-than-temporary impairments $ 6,261
Minimum [Member] | Investments with redemption restrictions [Member]  
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]  
Redemption restriction period 1 year
Minimum [Member] | Investments without redemption restrictions [Member] | Hedge Funds [Member]  
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]  
Redemption notice period 30 days
Gate trigger, percentage 15.00%
Maximum [Member] | Investments with redemption restrictions [Member]  
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]  
Redemption restriction period 3 years
Maximum [Member] | Investments without redemption restrictions [Member] | Hedge Funds [Member]  
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]  
Gate trigger, percentage 25.00%