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Investments (Narrative) (Details) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 6 Months Ended
Jun. 30, 2014
Other invested assets [Member]
Jun. 30, 2014
Minimum [Member]
Investments with redemption restrictions [Member]
Jun. 30, 2014
Minimum [Member]
Investments without redemption restrictions [Member]
Hedge Funds [Member]
Jun. 30, 2014
Maximum [Member]
Investments with redemption restrictions [Member]
Jun. 30, 2014
Maximum [Member]
Investments without redemption restrictions [Member]
Hedge Funds [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   3 years  
Redemption notice period     P30D    
Gate trigger, percentage     15.00%   25.00%
Loss on equity method investments $ (9,348)