<ARTICLE> 5
<LEGEND>
This schedule contains summary financial information extracted from the
financial statements filed as part of the Company's 10Q and is qualified in its
entirety by reference to such financial statements.
</LEGEND>
<MULTIPLIER> 1,000
       
                             
<PERIOD-TYPE>                   9-MOS
<FISCAL-YEAR-END>                          MAR-31-1999
<PERIOD-END>                               DEC-31-1998
<CASH>                                          16,602
<SECURITIES>                                         0
<RECEIVABLES>                                  108,007
<ALLOWANCES>                                       198
<INVENTORY>                                          0
<CURRENT-ASSETS>                               137,853
<PP&E>                                         398,774
<DEPRECIATION>                                 165,602
<TOTAL-ASSETS>                                 387,360
<CURRENT-LIABILITIES>                           91,462
<BONDS>                                        100,416
<PREFERRED-MANDATORY>                                0
<PREFERRED>                                          0
<COMMON>                                         6,004
<OTHER-SE>                                     171,796
<TOTAL-LIABILITY-AND-EQUITY>                   387,360
<SALES>                                        307,228
<TOTAL-REVENUES>                               307,228
<CGS>                                          240,716
<TOTAL-COSTS>                                  240,716
<OTHER-EXPENSES>                                     0
<LOSS-PROVISION>                                     0
<INTEREST-EXPENSE>                               2,333
<INCOME-PRETAX>                                 33,598
<INCOME-TAX>                                    12,777
<INCOME-CONTINUING>                             20,821
<DISCONTINUED>                                       0
<EXTRAORDINARY>                                      0
<CHANGES>                                            0
<NET-INCOME>                                    20,821
<EPS-PRIMARY>                                      .91
<EPS-DILUTED>                                      .91