<ARTICLE> 5
<LEGEND>
This schedule contains summary financial information extracted from the
financial statements filed as part of the Company's 10-Q and is qualified in
its entirety by reference to such financial statements.
</LEGEND>
<MULTIPLIER> 1000
       
                             
<PERIOD-TYPE>                   9-MOS
<FISCAL-YEAR-END>                          MAR-31-1997
<PERIOD-END>                               DEC-31-1996
<CASH>                                          39,902
<SECURITIES>                                         0
<RECEIVABLES>                                   84,477
<ALLOWANCES>                                     1,005
<INVENTORY>                                          0
<CURRENT-ASSETS>                               130,406
<PP&E>                                         270,673
<DEPRECIATION>                                 163,639
<TOTAL-ASSETS>                                 255,255
<CURRENT-LIABILITIES>                           79,335
<BONDS>                                              0
<PREFERRED-MANDATORY>                                0
<PREFERRED>                                          0
<COMMON>                                         6,004
<OTHER-SE>                                     147,526
<TOTAL-LIABILITY-AND-EQUITY>                   255,255
<SALES>                                        271,416
<TOTAL-REVENUES>                               271,416
<CGS>                                          209,378
<TOTAL-COSTS>                                  209,378
<OTHER-EXPENSES>                                     0
<LOSS-PROVISION>                                     0
<INTEREST-EXPENSE>                               1,956
<INCOME-PRETAX>                                 35,058
<INCOME-TAX>                                    19,491
<INCOME-CONTINUING>                             15,567
<DISCONTINUED>                                       0
<EXTRAORDINARY>                                      0
<CHANGES>                                            0
<NET-INCOME>                                    15,567
<EPS-PRIMARY>                                      .65
<EPS-DILUTED>                                      .65