<ARTICLE>                     5
       
                                                        
<PERIOD-TYPE>                   3-MOS                         6-MOS
<FISCAL-YEAR-END>                               DEC-31-1998          DEC-31-1998   
<PERIOD-START>                                  JAN-01-1998          APR-01-1998 
<PERIOD-END>                                    MAR-31-1998          JUN-30-1998
<CASH>                                          8,885                 5,407 
<SECURITIES>                                    0                     0     
<RECEIVABLES>                                   51,819                51,969
<ALLOWANCES>                                   (4,882)               (5,112)
<INVENTORY>                                     0                     0
<CURRENT-ASSETS>                                68,942                66,599
<PP&E>                                          222,840               235,145 
<DEPRECIATION>                                 (87,563)              (91,417) 
<TOTAL-ASSETS>                                  211,159              216,607  
<CURRENT-LIABILITIES>                           43,577               44,795 
<BONDS>                                         0                    0
<PREFERRED-MANDATORY>                           0                    0
<PREFERRED>                                     0                    0
<COMMON>                                        831                  831 
<OTHER-SE>                                      86,583               90,153
<TOTAL-LIABILITY-AND-EQUITY>                    211,159              216,607  
<SALES>                                         88,694               95,640  
<TOTAL-REVENUES>                                88,694               95,640 
<CGS>                                           0                    0
<TOTAL-COSTS>                                   84,605               88,862  
<OTHER-EXPENSES>                                91                   85  
<LOSS-PROVISION>                                0                    0  
<INTEREST-EXPENSE>                              913                  960 
<INCOME-PRETAX>                                 3,085                5,733 
<INCOME-TAX>                                    1,172                2,179 
<INCOME-CONTINUING>                             1,913                3,554 
<DISCONTINUED>                                  0                    0 
<EXTRAORDINARY>                                 0                    0 
<CHANGES>                                       0                    0 
<NET-INCOME>                                    1,913                3,554 
<EPS-PRIMARY>                                   0.23<F1>             0.43<F1>
<EPS-DILUTED>                                   0.23                 0.43
                                               
<FN>
<F1> EPS-BASIC
</FN>