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Investments (Investment Related Gains (Losses) Net) (Details) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 9 Months Ended
Sep. 30, 2014
Sep. 30, 2013
Sep. 30, 2014
Sep. 30, 2013
Investment Gains And Losses [Abstract]        
Other than Temporary Impairment Losses, Investments, Portion Recognized in Earnings, Net $ 246 $ 332 $ 1,419 $ 10,643
Impairment losses on equity securities 0 0 0 0
Gain on investment activity 8,819 21,560 51,773 70,085
Loss on investment activity (6,355) (30,434) (19,815) (48,406)
Other impairment losses and change in mortgage loan provision (2,041) 233 (5,686) (1,268)
Derivatives and other, net 22,141 (67,492) 200,563 56,381
Total investment related gains (losses), net $ 22,318 $ (76,465) $ 225,416 $ 66,149