<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>                   6-MOS
<FISCAL-YEAR-END>                          MAR-31-2000
<PERIOD-END>                               SEP-30-1999
<CASH>                                           8,177
<SECURITIES>                                         0
<RECEIVABLES>                                  112,370
<ALLOWANCES>                                        61
<INVENTORY>                                          0
<CURRENT-ASSETS>                               141,473
<PP&E>                                         439,635
<DEPRECIATION>                                 187,637
<TOTAL-ASSETS>                                 412,167
<CURRENT-LIABILITIES>                           82,953
<BONDS>                                        112,154
<PREFERRED-MANDATORY>                                0
<PREFERRED>                                          0
<COMMON>                                          6004
<OTHER-SE>                                     191,010
<TOTAL-LIABILITY-AND-EQUITY>                   412,167
<SALES>                                        199,265
<TOTAL-REVENUES>                               199,265
<CGS>                                          163,283
<TOTAL-COSTS>                                  163,283
<OTHER-EXPENSES>                                     0
<LOSS-PROVISION>                                     0
<INTEREST-EXPENSE>                               2,842
<INCOME-PRETAX>                                 14,301
<INCOME-TAX>                                     5,151
<INCOME-CONTINUING>                              9,150
<DISCONTINUED>                                       0
<EXTRAORDINARY>                                      0
<CHANGES>                                            0
<NET-INCOME>                                     9,150
<EPS-BASIC>                                      .41
<EPS-DILUTED>                                      .40