<ARTICLE> 5
<LEGEND>
THIS SCHEDULE CONTAINS SUMMARY FINANCIAL INFORMATION EXTRACTED FROM THE
UNAUDITED CONDENSED CONSOLIDATED FINANCIAL STATEMENTS AS OF SEPTEMBER 30, 2000
AND FOR THE NINE MONTHS ENDED SEPTEMBER 30, 2000 AND 1999, AS APPLICABLE. THIS
FINANCIAL INFORMATION IS QUALIFIED IN ITS ENTIRETY BY REFERENCE TO FILING ON
FORM 10-Q FOR THE QUARTERLY PERIODS ENDED SEPTEMBER 30, 2000 AND 1999.


                             
<PERIOD-TYPE>                   9-MOS
<FISCAL-YEAR-END>                          DEC-31-2000
<PERIOD-START>                             JAN-01-2000
<PERIOD-END>                               SEP-30-2000
<CASH>                                          62,682
<SECURITIES>                                         0
<RECEIVABLES>                                   61,096
<ALLOWANCES>                                         0
<INVENTORY>                                      2,241
<CURRENT-ASSETS>                               135,587
<PP&E>                                         188,120
<DEPRECIATION>                                 142,059
<TOTAL-ASSETS>                                 365,550
<CURRENT-LIABILITIES>                           45,648
<BONDS>                                              0
<PREFERRED-MANDATORY>                                0
<PREFERRED>                                          0
<COMMON>                                           373
<OTHER-SE>                                     286,408
<TOTAL-LIABILITY-AND-EQUITY>                   365,550
<SALES>                                              0
<TOTAL-REVENUES>                               204,333
<CGS>                                                0
<TOTAL-COSTS>                                  182,511
<OTHER-EXPENSES>                                 (561)
<LOSS-PROVISION>                                     0
<INTEREST-EXPENSE>                               4,347
<INCOME-PRETAX>                                 18,036
<INCOME-TAX>                                     6,568
<INCOME-CONTINUING>                             11,468
<DISCONTINUED>                                       0
<EXTRAORDINARY>                                      0
<CHANGES>                                            0
<NET-INCOME>                                    11,468
<EPS-BASIC>                                        .34
<EPS-DILUTED>                                      .33