WARNING: THE EDGAR SYSTEM ENCOUNTERED ERROR(S) WHILE PROCESSING THIS SCHEDULE.

  

<ARTICLE>
<LEGEND>
THE SCHEDULE CONTAINS SUMMARY FINANCIAL INFORMATION EXTRACTED FROM 
THE COMPANY'S CONSOLIDATED FINANCIAL STATEMENTS AND IS QUALIFIED 
IN ITS ENTIRETY BY REFERENCES TO SUCH FINANCIAL STATEMENTS.
</LEGEND>
<MULTIPLIER                        1,000
       
                         
<PERIOD-TYPE>               9-MOS
<FISCAL-YEAR-END>           DEC-31-1993
<PERIOD-END>                SEP-30-1994
<CASH>                          116,211
<SECURITIES>                          0
<RECEIVABLES>                    74,642
<ALLOWANCES>                          0
<INVENTORY>                         631
<CURRENT-ASSETS>                210,360
<PP&E>                          215,316
<DEPRECIATION>                  117,499
<TOTAL-ASSETS>                  367,861
<CURRENT LIABLILITIES>           90,366
<BONDS>                               0
<COMMON>                        251,578
<PREFERRED-MANDATORY>                 0
<PREFERRED>                           0
<OTHER-SE>                       29,893
<TOTAL-LIABILITY-AND-EQUITY>    367,861
<SALES>                         248,734
<TOTAL-REVENUES>                248,734
<CGS>                            78,612
<TOTAL-COSTS>                   157,232
<OTHER-EXPENSES>                 (2,094)
<LOSS-PROVISION>                      0
<INTEREST-EXPENSE>                1,855
<INCOME-PRETAX>                  14,984
<INCOME-TAX>                      2,800
<INCOME-CONTINUING>              12,184
<DISCONTINUED>                        0
<EXTRAORDINARY>                       0
<CHANGES>                             0
<NET-INCOME>                     12,184
<EPS-PRIMARY>                      0.25
<EPS-DILUTED>                      0.25