v2.4.0.6
UNAUDITED CONDENSED QUARTERLY FINANCIAL DATA (DETAILS) (USD $)
In Thousands, except Per Share data, unless otherwise specified
3 Months Ended 12 Months Ended
Dec. 31, 2011
Sep. 30, 2011
Jun. 30, 2011
Mar. 31, 2011
Dec. 31, 2010
Sep. 30, 2010
Jun. 30, 2010
Mar. 31, 2010
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
UNAUDITED CONDENSED QUARTER FINANCIAL INFORMATION [Abstract]                      
Net premiums earned $ 846,753 $ 839,992 $ 840,014 $ 788,201 $ 757,318 $ 758,873 $ 735,027 $ 696,192 $ 3,314,961 $ 2,947,410 $ 2,791,764
Net investment income 102,362 49,396 100,018 110,655 107,889 111,800 82,584 104,619 362,430 406,892 464,478
Net realized investment gains (losses) (3,738) 57,557 37,477 30,144 77,772 76,531 24,619 16,176 121,439 195,098 (311,584)
Underwriting income (loss) 15,076 90,029 28,974 (461,305) 132,546 127,376 120,836 28,446 (327,226) 409,203 524,635
Net income (loss) available to common shareholders $ 80,064 $ 212,058 $ 101,068 $ (383,760) $ 264,343 $ 238,842 $ 204,852 $ 111,812 $ 9,430 $ 819,848 $ 461,011
Basic earnings (loss) per common share $ 0.63 $ 1.68 $ 0.81 $ (3.39) $ 2.26 $ 1.99 $ 1.68 $ 0.87 $ 0.08 $ 6.74 $ 3.36
Diluted earnings (loss) per common share $ 0.63 $ 1.66 $ 0.79 $ (3.39) $ 1.99 $ 1.78 $ 1.51 $ 0.79 $ 0.07 $ 6.02 $ 3.07