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Income Taxes (Tables)
12 Months Ended
Dec. 31, 2011
Income Taxes [Abstract]  
Differences between our effective tax rate for financial statement purposes and the Federal Statutory rate
 2011 2010 2009 
          
Statutory tax rate 35.0% 35.0% 35.0%
          
Federal tax at statutory rate$124,252 $171,439 $181,493 
Nontaxable municipal bond interest and dividend received         
deduction (29,021)  (26,968)  (24,109) 
State income taxes, net of federal tax benefit 3,050  2,397  4,107 
Foreign income taxes 25,410  32,008  32,319 
Foreign tax credit (25,410)  (32,008)  (32,310) 
Uncertain tax positions (net of federal tax benefit (expense) on state         
positions: $212 in 2011, $(52) in 2010 and $(88) in 2009) 38  (1,532)  (1,704) 
Other, net 1,444  (605)  4,887 
Income tax expense$99,763 $144,731 $164,683 
Effective tax rate 28.1% 29.5% 31.8%
The components of income tax expense
  2011 2010 2009 
           
Federal current$47,993 $113,837 $125,126 
Federal deferred 21,075  (3,218)  5,704 
 Total federal 69,068  110,619  130,830 
State current 2,203  1,797  3,001 
State deferred 2,489  1,891  2,511 
 Total state 4,692  3,688  5,512 
Foreign current 28,543  31,691  27,996 
Foreign deferred (2,790)  317  2,137 
 Total foreign 25,753  32,008  30,133 
Uncertain tax positions 250  (1,584)  (1,792) 
 Income tax expense$99,763 $ 144,731 $ 164,683 
Composition of deferred tax assets and liabilities
  2011 2010
       
Excess of financial statement unearned premium over tax$26,217 $22,897
Discounting of loss reserves, net of salvage and subrogation 62,402  61,738
Excess of financial statement accrued expenses over tax 17,373  22,635
Allowance for bad debts, not deductible for tax 6,216  5,721
Stock-based compensation expense in excess of deduction for tax 9,712  12,339
Financial statement loss for Lloyd's syndicates in excess of deduction for tax 7,571  0
Federal tax net operating loss carryforwards 4,451  3,859
State tax net operating loss carryforwards, net of federal tax benefit 2,179  2,205
Federal benefit of state uncertain tax positions 424  211
Valuation allowance (7,607)  (7,767)
 Total deferred tax assets 128,938  123,838
Unrealized gain on increase in value of securities 120,854  48,656
Deferred policy acquisition costs, net of ceding commissions, deductible for tax 29,271  21,244
Amortizable goodwill for tax 84,110  72,252
Book basis in net assets of foreign subsidiaries in excess of tax 10,903  8,295
Property and equipment depreciation and other items 11,856  11,322
 Total deferred tax liabilities 256,994  161,769
  Net deferred tax liability$(128,056) $(37,931)
Changes in the valuation allowance
  2011 2010 2009 
           
Balance at beginning of year$7,767 $6,119 $4,698 
Net operating loss carryforwards (120)  1,676  1,472 
Other (40)  (28)  (51) 
 Balance at December 31$7,607 $7,767 $6,119 
Changes in our liability for unrecognized gross tax benefits
  2011 2010 2009 
           
Balance at beginning of year$2,274 $3,821 $5,002 
Gross increases         
Tax position of current year 160  289  670 
Tax position of prior years 763  259  664 
Gross decreases         
Statute expirations (595)  (1,244)  (1,630) 
Settlements 0  0  (766) 
Tax positions of prior years (80)  (851)  (119) 
  Balance at December 31$2,522 $2,274 $3,821