<TABLE> <S> <C>

<PAGE>
<ARTICLE> 5
<LEGEND>
THIS SCHEDULE CONTAINS SUMMARY FINANCIAL INFORMATION TO RETROACTIVELY REFLECT
CERTAIN BALANCE SHEET RECLASSIFICATIONS FOR THE PERIODS PRESENTED.  THIS
INFORMATION IS QUALIFIED IN ITS ENTIRETY BY REFERENCE TO THE COMPANY'S
CONSOLIDATED FINANCIAL STATEMENTS FOR EACH OF THE PERIODS ENDED JUNE 30, 1995,
MARCH 31, 1995 AND DECEMBER 31, 1994.
</LEGEND>
<RESTATED>
<MULTIPLIER> 1,000
       
<S>                             <C>                     <C>                     <C>
<PERIOD-TYPE>                   6-MOS                   3-MOS                   12-MOS
<FISCAL-YEAR-END>                          DEC-31-1995             DEC-31-1995             DEC-31-1994
<PERIOD-END>                               JUN-30-1995             MAR-31-1995             DEC-31-1994
<CASH>                                           8,972                  13,098                   9,973
<SECURITIES>                                         0                       0                       0
<RECEIVABLES>                                   12,515                  12,077                  15,140
<ALLOWANCES>                                         0                       0                       0
<INVENTORY>                                        228                     230                     293
<CURRENT-ASSETS>                                74,604                  26,375                  26,127
<PP&E>                                         309,203                 366,875                 355,983
<DEPRECIATION>                                 159,390                 168,097                 160,578
<TOTAL-ASSETS>                                 225,581                 228,226                 223,894
<CURRENT-LIABILITIES>                           36,133                  30,042                  30,229
<BONDS>                                         90,045                  99,088                 100,840
<COMMON>                                           591                     591                     574
<PREFERRED-MANDATORY>                                0                       0                       0
<PREFERRED>                                          4                       4                       4
<OTHER-SE>                                      93,702                  93,057                  87,132
<TOTAL-LIABILITY-AND-EQUITY>                   225,581                 228,226                 223,894
<SALES>                                         38,159                  17,832                  50,033
<TOTAL-REVENUES>                                39,562                  18,837                  51,359
<CGS>                                                0                       0                       0
<TOTAL-COSTS>                                   35,357                  17,529                 102,792
<OTHER-EXPENSES>                                 (152)                   (121)                   2,619
<LOSS-PROVISION>                                     0                       0                       0
<INTEREST-EXPENSE>                               3,851                   1,971                   6,638
<INCOME-PRETAX>                                    506                   (542)                (60,690)
<INCOME-TAX>                                        11                    (47)                   (455)
<INCOME-CONTINUING>                                495                   (495)                (60,235)
<DISCONTINUED>                                       0                       0                       0
<EXTRAORDINARY>                                  2,456                   2,456                   5,419
<CHANGES>                                            0                       0                       0
<NET-INCOME>                                     2,951                   1,961                (54,816)
<EPS-PRIMARY>                                      .17                     .13                  (7.02)
<EPS-DILUTED>                                      .17                     .13                  (7.02)
        

</TABLE>