<ARTICLE> 5
<LEGEND>
THIS SCHEDULE CONTAINS SUMMARY FINANCIAL INFORMATION EXTRACTED FROM (A) THE
CONSOLIDATED BALANCE SHEET AND CONSOLIDATED STATEMENT OF INCOME INCLUDED IN THE
COMPANY'S FORM 10-Q FOR THE PERIOD ENDING SEPTEMBER 30, 1998 AND IS QUALIFIED IN
ITS ENTIRETY BY REFERENCE TO SUCH (B) FINANCIAL STATEMENTS.
</LEGEND>
<MULTIPLIER> 1,000
       
                             
<PERIOD-TYPE>                   9-MOS
<FISCAL-YEAR-END>                          DEC-31-1998
<PERIOD-START>                             JAN-01-1998
<PERIOD-END>                               SEP-30-1998
<CASH>                                          76,656
<SECURITIES>                                   129,108
<RECEIVABLES>                                  145,330
<ALLOWANCES>                                     3,923
<INVENTORY>                                     14,221
<CURRENT-ASSETS>                               378,859
<PP&E>                                         152,419
<DEPRECIATION>                                  81,988
<TOTAL-ASSETS>                                 520,293
<CURRENT-LIABILITIES>                          101,394
<BONDS>                                        151,491
<PREFERRED-MANDATORY>                                0
<PREFERRED>                                          0
<COMMON>                                       172,394
<OTHER-SE>                                      95,014
<TOTAL-LIABILITY-AND-EQUITY>                   520,293
<SALES>                                        255,982
<TOTAL-REVENUES>                               377,500
<CGS>                                           81,833
<TOTAL-COSTS>                                  212,492
<OTHER-EXPENSES>                               151,464
<LOSS-PROVISION>                                     0
<INTEREST-EXPENSE>                               1,666
<INCOME-PRETAX>                                 63,967
<INCOME-TAX>                                    23,977
<INCOME-CONTINUING>                             39,990
<DISCONTINUED>                                       0
<EXTRAORDINARY>                                      0
<CHANGES>                                            0
<NET-INCOME>                                    39,990
<EPS-PRIMARY>                                    (0.56)
<EPS-DILUTED>                                    (0.56)