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Investments (Narrative) (Details) - Jun. 30, 2015 - USD ($)
$ in Thousands
Total
Total
Other invested assets [Member]    
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]    
Other-than-temporary impairments $ 6,261  
Loss on equity method investments $ (9,348)  
Minimum [Member] | Investments with redemption restrictions [Member]    
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]    
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share, Redemption Restriction, Period in Effect   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% 15.00%
Maximum [Member] | Investments with redemption restrictions [Member]    
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]    
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share, Redemption Restriction, Period in Effect   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% 25.00%