<TABLE> <S> <C>

<PAGE>
<ARTICLE> 5
<LEGEND>
THIS SCHEDULE CONTAINS RESTATED SUMMARY FINANCIAL INFORMATION EXTRACTED FROM THE
REGISTRANT'S FINANCIAL STATEMENTS FOR ITS QUARTERS ENDED MARCH 31, 1997, JUNE
30, 1997 AND SEPTEMBER 30, 1997 AND IS QUALIFIED IN ITS ENTIRETY BY REFERENCE
TO SUCH FINANCIAL STATEMENTS
</LEGEND>
       
<S>                             <C>                     <C>                     <C>
<PERIOD-TYPE>                   9-MOS                   6-MOS                   3-MOS
<FISCAL-YEAR-END>                          DEC-31-1997             DEC-31-1997             DEC-31-1997
<PERIOD-END>                               SEP-30-1997             JUN-30-1997             MAR-31-1997
<CASH>                                          11,510                  11,509                  15,100
<SECURITIES>                                         0                       0                       0
<RECEIVABLES>                                   12,056                  10,714                  12,403
<ALLOWANCES>                                         0                       0                       0
<INVENTORY>                                      3,102                   2,998                   2,674
<CURRENT-ASSETS>                                27,806                  26,309                  31,528
<PP&E>                                         128,335                 129,849                 132,488
<DEPRECIATION>                                       0                       0                       0
<TOTAL-ASSETS>                                 172,511                 168,927                 174,163
<CURRENT-LIABILITIES>                           21,143                  21,467                  25,511
<BONDS>                                              0                       0                       0
<PREFERRED-MANDATORY>                                0                       0                       0
<PREFERRED>                                          0                       0                       0
<COMMON>                                            64                      64                      64
<OTHER-SE>                                    (23,338)                (26,041)                (26,561)
<TOTAL-LIABILITY-AND-EQUITY>                   172,511                 168,927                 174,163
<SALES>                                         48,401                  31,512                  17,457
<TOTAL-REVENUES>                                48,401                  31,512                  17,457
<CGS>                                           23,922                  15,616                   7,442
<TOTAL-COSTS>                                   23,992                  15,616                   7,442
<OTHER-EXPENSES>                                 5,380                   3,484                   2,052
<LOSS-PROVISION>                                     0                       0                       0
<INTEREST-EXPENSE>                              11,001                   7,331                   3,537
<INCOME-PRETAX>                                  8,098                   5,081                   4,426
<INCOME-TAX>                                       747                     523                     339
<INCOME-CONTINUING>                              7,351                   4,558                   4,087
<DISCONTINUED>                                       0                       0                       0
<EXTRAORDINARY>                                      0                       0                       0
<CHANGES>                                            0                       0                       0
<NET-INCOME>                                     7,351                   4,558                   4,087
<EPS-PRIMARY>                                     1.14                    0.71                    0.63
<EPS-DILUTED>                                     1.11                    0.69                    0.62
        

</TABLE>