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Investments (Details) - Analysis of net realized gains (losses) and the change in unrealized (losses) gains on investments (USD $)
In Thousands, unless otherwise specified
3 Months Ended 6 Months Ended
Jun. 30, 2012
Jun. 30, 2011
Jun. 30, 2012
Jun. 30, 2011
Net realized gains (losses):        
Gross realized gains $ 53,732 $ 61,037 $ 120,621 $ 88,179
Gross realized losses on investments sold (37,932) (43,405) (63,053) (99,539)
OTTI on investments, net of amounts transferred to other comprehensive income (28,193) (27,176) (49,158) (64,621)
Total net realized (losses) on investments $ (12,393) $ (9,544) $ 8,410 $ (75,981)