<ARTICLE> 5
<MULTIPLIER> 1,000
<CURRENCY> U.S. DOLLARS
       
                             
<PERIOD-TYPE>                   12-MOS
<FISCAL-YEAR-END>                          DEC-31-1997
<PERIOD-START>                             JAN-01-1997
<PERIOD-END>                               DEC-31-1997
<EXCHANGE-RATE>                                      1
<CASH>                                             722
<SECURITIES>                                         0
<RECEIVABLES>                                   43,896
<ALLOWANCES>                                       314
<INVENTORY>                                      2,662
<CURRENT-ASSETS>                                52,036
<PP&E>                                         189,327
<DEPRECIATION>                                 123,053
<TOTAL-ASSETS>                                 127,825
<CURRENT-LIABILITIES>                           32,842
<BONDS>                                              0
<PREFERRED-MANDATORY>                                0
<PREFERRED>                                          0
<COMMON>                                         8,728
<OTHER-SE>                                      49,159
<TOTAL-LIABILITY-AND-EQUITY>                   127,825
<SALES>                                              0
<TOTAL-REVENUES>                               295,079
<CGS>                                                0
<TOTAL-COSTS>                                  273,230
<OTHER-EXPENSES>                                     0
<LOSS-PROVISION>                                     0
<INTEREST-EXPENSE>                               2,703
<INCOME-PRETAX>                                 19,251
<INCOME-TAX>                                     7,972
<INCOME-CONTINUING>                             11,279
<DISCONTINUED>                                       0
<EXTRAORDINARY>                                      0
<CHANGES>                                            0
<NET-INCOME>                                    11,279
<EPS-PRIMARY>                                     2.57<F1>
<EPS-DILUTED>                                     2.39
<FN>
<F1>Tag 40 Basic EPS
</FN>