<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-31-1998
<PERIOD-END>                               DEC-31-1997
<CASH>                                          20,072
<SECURITIES>                                         0
<RECEIVABLES>                                  106,113
<ALLOWANCES>                                       134
<INVENTORY>                                          0
<CURRENT-ASSETS>                               138,332
<PP&E>                                         296,003
<DEPRECIATION>                                 150,503
<TOTAL-ASSETS>                                 301,729
<CURRENT-LIABILITIES>                           91,067
<BONDS>                                         38,000
<PREFERRED-MANDATORY>                                0
<PREFERRED>                                          0
<COMMON>                                         6,004
<OTHER-SE>                                     149,403
<TOTAL-LIABILITY-AND-EQUITY>                   301,729
<SALES>                                        271,975
<TOTAL-REVENUES>                               271,975
<CGS>                                          214,125
<TOTAL-COSTS>                                  214,125
<OTHER-EXPENSES>                                     0
<LOSS-PROVISION>                                     0
<INTEREST-EXPENSE>                                 214
<INCOME-PRETAX>                                 28,666
<INCOME-TAX>                                    10,993
<INCOME-CONTINUING>                             17,673
<DISCONTINUED>                                       0
<EXTRAORDINARY>                                      0
<CHANGES>                                            0
<NET-INCOME>                                    17,673
<EPS-PRIMARY>                                      .75
<EPS-DILUTED>                                      .75