<TABLE> <S> <C>
<PAGE>
<ARTICLE> 7
<MULTIPLIER> 1,000
<S> <C>
<PERIOD-TYPE> 6-MOS
<FISCAL-YEAR-END> DEC-31-2000
<PERIOD-START> JAN-01-2000
<PERIOD-END> JUN-30-2000
<DEBT-HELD-FOR-SALE> 1,531,976
<DEBT-CARRYING-VALUE> 0
<DEBT-MARKET-VALUE> 0
<EQUITIES> 284,055
<MORTGAGE> 0
<REAL-ESTATE> 0
<TOTAL-INVEST> 1,942,780
<CASH> 10,536
<RECOVER-REINSURE> 52,581
<DEFERRED-ACQUISITION> 68,769
<TOTAL-ASSETS> 2,225,528
<POLICY-LOSSES> 291,735
<UNEARNED-PREMIUMS> 172,956
<POLICY-OTHER> 0
<POLICY-HOLDER-FUNDS> 0
<NOTES-PAYABLE> 139,930
0
0
<COMMON> 528
<OTHER-SE> 1,330,533
<TOTAL-LIABILITY-AND-EQUITY> 2,225,528
305,549
<INVESTMENT-INCOME> 56,118
<INVESTMENT-GAINS> 1,138
<OTHER-INCOME> 4,506
<BENEFITS> 54,934
<UNDERWRITING-AMORTIZATION> 40,814
<UNDERWRITING-OTHER> 81,560
<INCOME-PRETAX> 180,905
<INCOME-TAX> 55,936
<INCOME-CONTINUING> 124,969
<DISCONTINUED> 0
<EXTRAORDINARY> 0
<CHANGES> 0
<NET-INCOME> 124,969
<EPS-BASIC> 2.82
<EPS-DILUTED> 2.79
<RESERVE-OPEN> 0
<PROVISION-CURRENT> 0
<PROVISION-PRIOR> 0
<PAYMENTS-CURRENT> 0
<PAYMENTS-PRIOR> 0
<RESERVE-CLOSE> 0
<CUMULATIVE-DEFICIENCY> 0
</TABLE>