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Consolidated Balance Sheets (USD $)
In Thousands
 6 Months Ended 12 Months Ended
Jun. 30, 2011
Dec. 31, 2010
ASSETS    
Fixed maturity securities, held-to-maturity - at carrying value (fair value: $1,120,977 - 2011; $1,256,294 - 2010) $ 1,070,578 $ 1,214,324
Fixed maturity securities, available-for-sale - at fair value (amortized cost: $2,442,579 - 2011; $2,285,988 - 2010) 2,525,237 2,342,742
Equity securities, available-for-sale - at fair value (cost of: $128,187 - 2011; $58,039 - 2010) 136,577 69,636
Short-term investments (at cost which approximates fair value) 142,809 161,155
Other investments 132,137 137,865
Total investments 4,007,338 3,925,722
Cash 185 645
Interest and dividends due or accrued 36,596 37,007
Premiums receivable, net of allowance for uncollectible accounts of: $4,054 - 2011; $4,691 - 2010 467,122 414,105
Reinsurance recoverables, net 338,122 318,752
Prepaid reinsurance premiums 115,943 110,327
Current federal income tax 7,304 11,200
Deferred federal income tax 87,899 93,234
Property and equipment - at cost, net of accumulated depreciation and amortization of: $156,209 - 2011; $151,704 - 2010 39,998 41,775
Deferred policy acquisition costs 216,185 209,627
Goodwill 7,849 7,849
Other assets 45,107 61,529
Total assets 5,369,648 5,231,772
LIABILITIES AND STOCKHOLDERS' EQUITY    
Reserve for losses and loss expenses 2,898,592 2,830,058
Unearned premiums 858,627 823,596
Notes payable 262,346 262,333
Accrued salaries and benefits 100,378 100,933
Other liabilities 148,671 143,743
Total liabilities 4,268,614 4,160,663
Stockholders' Equity:    
Preferred stock of $0 par value per share: Authorized shares: 5,000,000; no shares issued or outstanding 0 0
Common stock of $2 par value per share Authorized shares: 360,000,000 Issued: 96,987,900 - 2011; 96,362,667 - 2010 193,976 192,725
Additional paid-in capital 252,189 244,613
Retained earnings 1,185,659 1,176,155
Accumulated other comprehensive income 21,144 7,024
Treasury stock - at cost (shares: 42,823,108 - 2011; 42,686,204 - 2010) (551,934) (549,408)
Total stockholders' equity 1,101,034 1,071,109
Commitments and contingencies    
Total liabilities and stockholders' equity $ 5,369,648 $ 5,231,772