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Investments (Details 2) (USD $)
In Thousands, unless otherwise specified
3 Months Ended
Mar. 31, 2013
Mar. 31, 2012
Effect of trading activities by type of instrument and by line item in the condensed consolidated statements of income    
Total realized gains (losses) on trading portfolio $ (16,037) $ (7,449)
Total change in unrealized gains (losses) on trading portfolio 7,874 9,187
Net gains (losses) recognized on trading portfolio (8,163) 1,738
Fixed maturities [Member]
   
Effect of trading activities by type of instrument and by line item in the condensed consolidated statements of income    
Total change in unrealized gains (losses) on trading portfolio 13 37
Equity securities [Member]
   
Effect of trading activities by type of instrument and by line item in the condensed consolidated statements of income    
Total realized gains (losses) on trading portfolio (15,969) (7,593)
Total change in unrealized gains (losses) on trading portfolio 7,758 8,989
Derivatives (non-hedging instruments) [Member]
   
Effect of trading activities by type of instrument and by line item in the condensed consolidated statements of income    
Total realized gains (losses) on trading portfolio (68) 144
Total change in unrealized gains (losses) on trading portfolio 89 147
Other [Member]
   
Effect of trading activities by type of instrument and by line item in the condensed consolidated statements of income    
Total change in unrealized gains (losses) on trading portfolio $ 14 $ 14