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Consolidated Statements Of Operations (USD $)
In Thousands, except Per Share data, unless otherwise specified
 3 Months Ended
Mar. 31, 2012
Mar. 31, 2011
Revenues:    
Net premiums earned $ 635,812 $ 638,487
Net investment income 31,486 35,096
Net realized investment gains 52,663 28,690
Other 2,714 3,270
Total revenues 722,675 705,543
Expenses:    
Losses and loss adjustment expenses 449,916 446,461
Policy acquisition costs 117,430 121,804
Other operating expenses 52,925 58,672
Interest 410 1,695
Total expenses 620,681 628,632
Income before income taxes 101,994 76,911
Income tax expense 28,638 18,685
Net income $ 73,356 $ 58,226
Net income per share:    
Basic $ 1.34 $ 1.06
Diluted $ 1.34 $ 1.06
Weighted average shares outstanding:    
Basic 54,877 54,809
Diluted 54,908 54,831
Dividends paid per share $ 0.61 $ 0.60