<ARTICLE>                          5
<MULTIPLIER>                       1,000

                                
<FISCAL-YEAR-END>                  MAY-31-2000
<PERIOD-START>                     JUN-1-1999
<PERIOD-END>                       FEB-29-2000
<PERIOD-TYPE>                      9-MOS
<CASH>                                             861
<SECURITIES>                                        0
<RECEIVABLES>                                   42,443
<ALLOWANCES>                                     6,392
<INVENTORY>                                         0
<CURRENT-ASSETS>                                    0
<PP&E>                                         487,105
<DEPRECIATION>                                 263,333
<TOTAL-ASSETS>                                 326,464
<CURRENT-LIABILITIES>                               0
<BONDS>                                             0
<PREFERRED-MANDATORY>                               0
<PREFERRED>                                         0
<COMMON>                                        10,887
<OTHER-SE>                                          0
<TOTAL-LIABILITY-AND-EQUITY>                   326,464
<SALES>                                         31,141
<TOTAL-REVENUES>                               183,307
<CGS>                                           26,844
<TOTAL-COSTS>                                  149,832
<OTHER-EXPENSES>                                    0
<LOSS-PROVISION>                                    0
<INTEREST-EXPENSE>                               4,512
<INCOME-PRETAX>                                 28,963
<INCOME-TAX>                                    11,005
<INCOME-CONTINUING>                             17,958
<DISCONTINUED>                                      0
<EXTRAORDINARY>                                     0
<CHANGES>                                           0
<NET-INCOME>                                    17,958
<EPS-BASIC>                                     0.73
<EPS-DILUTED>                                     0.72