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UNAUDITED CONDENSED QUARTERLY FINANCIAL DATA (DETAILS) (USD $)
In Thousands, except Per Share data, unless otherwise specified |
3 Months Ended | 12 Months Ended | |||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|
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Dec. 31, 2013
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Sep. 30, 2013
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Jun. 30, 2013
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Mar. 31, 2013
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Dec. 31, 2012
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Sep. 30, 2012
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Jun. 30, 2012
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Mar. 31, 2012
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Dec. 31, 2013
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Dec. 31, 2012
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Dec. 31, 2011
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| Quarterly Financial Information Disclosure [Abstract] | |||||||||||
| Net premiums earned | $ 941,911 | $ 945,242 | $ 945,873 | $ 874,039 | $ 856,049 | $ 862,447 | $ 850,603 | $ 846,362 | $ 3,707,065 | $ 3,415,463 | $ 3,314,961 |
| Net investment income | 113,863 | 103,429 | 83,112 | 108,908 | 86,847 | 103,638 | 74,449 | 116,023 | 409,312 | 380,957 | 362,430 |
| Net realized investment gains (losses) | 19,558 | (4,708) | 16,235 | 44,478 | 31,771 | 50,803 | 30,405 | 14,491 | 75,564 | 127,469 | 121,439 |
| Underwriting income (loss) | 94,159 | 153,088 | 9,921 | 170,799 | (74,291) | 154,999 | 119,739 | 62,689 | |||
| Net income (loss) available to common shareholders | $ 171,524 | $ 137,121 | $ 72,447 | $ 302,816 | $ (18,551) | $ 223,407 | $ 168,152 | $ 121,997 | $ 683,910 | $ 495,004 | $ 9,430 |
| Basic earnings per common share | $ 1.55 | $ 1.23 | $ 0.63 | $ 2.59 | $ (0.16) | $ 1.84 | $ 1.36 | $ 0.97 | $ 6.02 | $ 4.05 | $ 0.08 |
| Diluted earnings per common share | $ 1.52 | $ 1.21 | $ 0.62 | $ 2.55 | $ (0.16) | $ 1.82 | $ 1.35 | $ 0.96 | $ 5.93 | $ 4.00 | $ 0.07 |