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<TABLE> <S> <C>
<PAGE>
<ARTICLE> 5
<S> <C> <C> <C>
<PERIOD-TYPE> 3-MOS 6-MOS 9-MOS
<FISCAL-YEAR-END> DEC-31-1999 DEC-31-1999 DEC-31-1999
<PERIOD-END> MAR-31-1999 JUN-30-1999 SEP-30-1999
<CASH> 14,112 10,491 21,775
<SECURITIES> 36,230 34,136 37,296
<RECEIVABLES> 85,962 89,957 90,660
<ALLOWANCES> 3,167 3,295 3,448
<INVENTORY> 0 0 0
<CURRENT-ASSETS> 7,100 7,876 8,551
<PP&E> 132,201 151,391 160,750
<DEPRECIATION> 44,416 50,942 57,370
<TOTAL-ASSETS> 267,692 274,320 294,938
<CURRENT-LIABILITIES> 65,018 62,349 70,886
<BONDS> 0 0 0
0 0 0
0 0 0
<COMMON> 642 643 645
<OTHER-SE> 175,786 183,080 196,233
<TOTAL-LIABILITY-AND-EQUITY> 267,692 274,320 294,938
<SALES> 119,475 248,877 383,568
<TOTAL-REVENUES> 119,475 248,877 383,568
<CGS> 80,387 166,241 256,576
<TOTAL-COSTS> 110,116 228,859 352,152
<OTHER-EXPENSES> (685) (1,229) 8,764
<LOSS-PROVISION> 0 0 0
<INTEREST-EXPENSE> 489 1,041 1,690
<INCOME-PRETAX> 9,555 20,206 38,489
<INCOME-TAX> 3,778 8,009 15,257
<INCOME-CONTINUING> 5,777 12,197 23,233
<DISCONTINUED> 0 0 0
<EXTRAORDINARY> 0 0 0
<CHANGES> 0 0 0
<NET-INCOME> 5,777 12,197 23,233
<EPS-BASIC> .09 .19 .36
<EPS-DILUTED> .09 .19 .35
</TABLE>
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