<ARTICLE> 5
<MULTIPLIER> 1,000

                             
<PERIOD-TYPE>                   12-MOS
<FISCAL-YEAR-END>                          DEC-31-1999
<PERIOD-START>                             JAN-01-1999
<PERIOD-END>                               DEC-31-1999
<CASH>                                          61,865
<SECURITIES>                                         0
<RECEIVABLES>                                   92,773
<ALLOWANCES>                                     4,717
<INVENTORY>                                          0
<CURRENT-ASSETS>                               185,140
<PP&E>                                         278,805
<DEPRECIATION>                                 110,871
<TOTAL-ASSETS>                                 408,989
<CURRENT-LIABILITIES>                           80,713
<BONDS>                                         45,196
<PREFERRED-MANDATORY>                                0
<PREFERRED>                                          0
<COMMON>                                           633
<OTHER-SE>                                     291,329
<TOTAL-LIABILITY-AND-EQUITY>                   408,989
<SALES>                                        562,444
<TOTAL-REVENUES>                               562,444
<CGS>                                          288,503
<TOTAL-COSTS>                                  482,936
<OTHER-EXPENSES>                                   627
<LOSS-PROVISION>                                     0
<INTEREST-EXPENSE>                               3,373
<INCOME-PRETAX>                                 80,358
<INCOME-TAX>                                    30,604
<INCOME-CONTINUING>                             49,754
<DISCONTINUED>                                       0
<EXTRAORDINARY>                                      0
<CHANGES>                                            0
<NET-INCOME>                                    49,754
<EPS-BASIC>                                       0.79
<EPS-DILUTED>                                     0.77