<ARTICLE> 5

                                                  
<PERIOD-TYPE>                   3-MOS                   6-MOS
<FISCAL-YEAR-END>                          DEC-31-2000             DEC-31-2000
<PERIOD-END>                               MAR-31-2000             JUN-30-2000
<CASH>                                          20,329                   6,360
<SECURITIES>                                    31,507                  47,406
<RECEIVABLES>                                  126,972                 151,067
<ALLOWANCES>                                     4,210                   4,524
<INVENTORY>                                          0                       0
<CURRENT-ASSETS>                                14,791                   7,939
<PP&E>                                         187,232                 222,374
<DEPRECIATION>                                  72,638                  81,427
<TOTAL-ASSETS>                                 355,662                 465,864
<CURRENT-LIABILITIES>                           76,661                 116,142
<BONDS>                                              0                       0
<PREFERRED-MANDATORY>                                0                       0
<PREFERRED>                                          0                       0
<COMMON>                                           653                     660
<OTHER-SE>                                     234,388                 295,879
<TOTAL-LIABILITY-AND-EQUITY>                   355,662                 465,864
<SALES>                                        172,505                 369,854
<TOTAL-REVENUES>                               172,505                 369,854
<CGS>                                          113,657                 245,991
<TOTAL-COSTS>                                  155,790                 335,027
<OTHER-EXPENSES>                                 (685)                (13,398)
<LOSS-PROVISION>                                     0                       0
<INTEREST-EXPENSE>                                 895                   2,088
<INCOME-PRETAX>                                 16,505                  46,137
<INCOME-TAX>                                     6,390                  17,567
<INCOME-CONTINUING>                             10,115                  28,570
<DISCONTINUED>                                       0                       0
<EXTRAORDINARY>                                      0                       0
<CHANGES>                                            0                       0
<NET-INCOME>                                    10,115                  28,171
<EPS-BASIC>                                        .16                     .43
<EPS-DILUTED>                                      .14                     .40