<TABLE> <S> <C>

<PAGE>

<ARTICLE> 5
<RESTATED> 
<MULTIPLIER> 1,000
       
<S>                             <C>                    <C>                  <C>                 <C>                 <C>
<PERIOD-TYPE>                   3-MOS                  3-MOS                6-MOS               3-MOS               9-MOS
<FISCAL-YEAR-END>               DEC-31-1997            DEC-31-1997          DEC-31-1997         DEC-31-1997         DEC-31-1997
<PERIOD-START>                  JAN-01-1997            APR-01-1997          JAN-01-1997         JUL-01-1997         JAN-01-1997
<PERIOD-END>                    MAR-31-1997            JUN-30-1997          JUN-30-1997         SEP-30-1997         SEP-30-1997
<CASH>                                  195                    195                    0               5,270                   0
<SECURITIES>                              0                      0                    0                   0                   0
<RECEIVABLES>                        39,961                 39,691                    0              55,985                   0
<ALLOWANCES>                              0                      0                    0                   0                   0
<INVENTORY>                           5,817                  5,817                    0              12,196                   0
<CURRENT-ASSETS>                          0                      0                    0                   0                   0
<PP&E>                              263,849                263,849                    0             395,168                   0
<DEPRECIATION>                            0                      0                    0                   0                   0
<TOTAL-ASSETS>                      313,703                313,703                    0             488,329                   0
<CURRENT-LIABILITIES>                69,770                 69,770                    0             222,141                   0
<BONDS>                                   0                      0                    0                   0                   0
<PREFERRED-MANDATORY>                     0                      0                    0                   0                   0
<PREFERRED>                               0                      0                    0                   0                   0
<COMMON>                                307                    307                    0                 307                   0
<OTHER-SE>                                0                      0                    0                   0                   0
<TOTAL-LIABILITY-AND-EQUITY>        313,703                313,703                    0             488,329                   0
<SALES>                              65,330                 77,109              142,439              93,470             235,909
<TOTAL-REVENUES>                     80,981                 96,434              177,415             114,026             291,441
<CGS>                                52,772                 57,084              110,078              66,797             176,875
<TOTAL-COSTS>                        62,651                 69,157              132,030              79,111             211,141
<OTHER-EXPENSES>                     29,995                 13,192               42,965              14,960              57,925
<LOSS-PROVISION>                          0                      0                    0                   0                   0
<INTEREST-EXPENSE>                    1,583                    504                2,057               1,744               3,972
<INCOME-PRETAX>                    (13,639)                 13,358                (281)              18,211              17,930
<INCOME-TAX>                          9,112                  5,343               14,455               7,354              21,809
<INCOME-CONTINUING>                (22,751)                  8,015             (14,736)              10,857             (3,879)
<DISCONTINUED>                            0                      0                    0                   0                   0
<EXTRAORDINARY>                       1,511                      0                1,511                   0               1,511
<CHANGES>                                 0                      0                    0                   0                   0
<NET-INCOME>                       (24,262)                  8,015             (16,247)              10,857             (5,390)
<EPS-PRIMARY>                         (.96)                    .29                (.58)                 .38               (.19)
<EPS-DILUTED>                         (.95)                    .28                (.57)                 .37               (.18)
        

</TABLE>