<ARTICLE> 5
<LEGEND>
This schedule contains summary consolidated financial information extracted from
the Company's Form 10-Q/A-2 for the six-month period ended June 30, 2000 and is
qualified in its entirety by reference to such Form 10-Q/A-2.
</LEGEND>

                             
<PERIOD-TYPE>                   6-MOS
<FISCAL-YEAR-END>                          DEC-31-2000
<PERIOD-START>                             JAN-01-2000
<PERIOD-END>                               JUN-30-2000
<CASH>                                      96,458,337
<SECURITIES>                                         0
<RECEIVABLES>                              143,980,362
<ALLOWANCES>                                 2,312,322
<INVENTORY>                                          0
<CURRENT-ASSETS>                           254,820,631
<PP&E>                                     264,708,073
<DEPRECIATION>                             120,673,048
<TOTAL-ASSETS>                             437,214,931
<CURRENT-LIABILITIES>                      108,836,309
<BONDS>                                              0
<PREFERRED-MANDATORY>                                0
<PREFERRED>                                          0
<COMMON>                                       430,362
<OTHER-SE>                                 241,846,084
<TOTAL-LIABILITY-AND-EQUITY>               437,214,931
<SALES>                                    317,178,684
<TOTAL-REVENUES>                           317,178,684
<CGS>                                                0
<TOTAL-COSTS>                              200,816,736
<OTHER-EXPENSES>                           109,779,399
<LOSS-PROVISION>                                     0
<INTEREST-EXPENSE>                           2,328,291
<INCOME-PRETAX>                             88,422,377
<INCOME-TAX>                                26,826,592
<INCOME-CONTINUING>                         61,594,785
<DISCONTINUED>                                       0
<EXTRAORDINARY>                                      0
<CHANGES>                                            0
<NET-INCOME>                                61,594,785
<EPS-BASIC>                                       1.46
<EPS-DILUTED>                                     1.45