<ARTICLE>                     5
<MULTIPLIER>                  1000
       
                                                                                                       
<PERIOD-TYPE>                   12-MOS                       12-MOS                   12-MOS                       6-MOS
<FISCAL-YEAR-END>                         DEC-31-1994           DEC-31-1995               DEC-31-1996                   DEC-31-1997
<PERIOD-START>                            JAN-01-1994           JAN-01-1995               JAN-01-1996                   JAN-01-1997
<PERIOD-END>                              DEC-31-1994           DEC-31-1995               DEC-31-1996                   JUN-30-1997
<CASH>                                              0                 1,146                     2,403                         4,842
<SECURITIES>                                        0                     0                         0                             0
<RECEIVABLES>                                       0                14,980                    18,277                        20,074
<ALLOWANCES>                                        0                  (500)                   (1,154)                       (1,381)
<INVENTORY>                                         0                     0                         0                             0
<CURRENT-ASSETS>                                    0                19,050                    22,035                        27,165
<PP&E>                                              0                61,503                    81,539                        92,062
<DEPRECIATION>                                      0               (14,545)                  (22,572)                      (24,636
)
<TOTAL-ASSETS>                                      0                66,427                    82,355                        96,047
<CURRENT-LIABILITIES>                               0                21,777                    27,952                        30,507
<BONDS>                                             0                     0                         0                             0
<PREFERRED-MANDATORY>                               0                     0                         0                             0
<PREFERRED>                                         0                     0                         0                             0
<COMMON>                                            0                 1,014                     1,128                         1,128
<OTHER-SE>                                          0                17,222                    22,943                        26,100
<TOTAL-LIABILITY-AND-EQUITY>                        0                66,427                    82,355                        96,047
<SALES>                                       119,299               125,973                   154,799                        90,417
<TOTAL-REVENUES>                              119,299               125,973                   154,799                        90,417
<CGS>                                               0                     0                         0                             0
<TOTAL-COSTS>                                 107,562               119,923                   145,409                        84,308
<OTHER-EXPENSES>                                 (106)                 (153)                     (200)                          (55)
<LOSS-PROVISION>                                    0                     0                         0                             0
<INTEREST-EXPENSE>                              1,080                 1,773                     2,966                         1,629
<INCOME-PRETAX>                                10,763                 4,430                     6,624                         4,535
<INCOME-TAX>                                      351                   191                       429                           180
<INCOME-CONTINUING>                            10,412                 4,239                     6,195                         4,355
<DISCONTINUED>                                      0                     0                         0                             0
<EXTRAORDINARY>                                     0                     0                         0                             0
<CHANGES>                                           0                     0                         0                             0
<NET-INCOME>                                   10,412                 4,239                     6,195                         4,355
<EPS-PRIMARY>                                       0                     0                         0                             0
<EPS-DILUTED>                                       0                     0                         0                             0