<ARTICLE>                          5
<MULTIPLIER>                       1,000
       
                                
<FISCAL-YEAR-END>                  MAY-31-1994
<PERIOD-START>                     JUN-1-1994
<PERIOD-END>                       NOV-30-1994
<PERIOD-TYPE>                      6-MOS
<CASH>                                             382
<SECURITIES>                                         0
<RECEIVABLES>                                   21,956
<ALLOWANCES>                                     1,347
<INVENTORY>                                          0
<CURRENT-ASSETS>                                     0
<PP&E>                                         249,285
<DEPRECIATION>                                 108,341
<TOTAL-ASSETS>                                 168,945
<CURRENT-LIABILITIES>                                0
<BONDS>                                              0
<PREFERRED-MANDATORY>                                0
<PREFERRED>                                          0
<COMMON>                                         2,536
<OTHER-SE>                                      82,208
<TOTAL-LIABILITY-AND-EQUITY>                   168,945
<SALES>                                         11,277
<TOTAL-REVENUES>                                58,539
<CGS>                                            9,708
<TOTAL-COSTS>                                   45,430
<OTHER-EXPENSES>                                     0
<LOSS-PROVISION>                                     0
<INTEREST-EXPENSE>                                 909
<INCOME-PRETAX>                                 12,200
<INCOME-TAX>                                     5,002
<INCOME-CONTINUING>                              7,198
<DISCONTINUED>                                       0
<EXTRAORDINARY>                                      0
<CHANGES>                                            0
<NET-INCOME>                                     7,198
<EPS-PRIMARY>                                     0.92
<EPS-DILUTED>                                     0.92