<TABLE> <S> <C>

<PAGE>
<ARTICLE> 5
<RESTATED> 
<MULTIPLIER> 1,000
       
<S>                             <C>                     <C>                     <C>
<PERIOD-TYPE>                   3-MOS                   6-MOS                   9-MOS
<FISCAL-YEAR-END>                          DEC-31-1997             DEC-31-1997             DEC-31-1997
<PERIOD-END>                               MAR-31-1997             JUN-30-1997             SEP-30-1997
<CASH>                                           6,046                   5,447                   9,275
<SECURITIES>                                         0                       0                       0
<RECEIVABLES>                                    6,911                   6,730                   8,529
<ALLOWANCES>                                     1,919                   1,722                   1,518
<INVENTORY>                                          0                       0                       0
<CURRENT-ASSETS>                                21,326<F1><F2>          21,936<F4><F5>          20,994<F7><F8>
<PP&E>                                         442,117                 560,744                 571,337
<DEPRECIATION>                                  52,056                  52,711                  55,632
<TOTAL-ASSETS>                                 411,387                 529,969                 545,974
<CURRENT-LIABILITIES>                            4,405                   5,843                   9,233
<BONDS>                                        235,411                 281,723                 295,951
<PREFERRED-MANDATORY>                                0                       0                       0
<PREFERRED>                                          0                       0                       0
<COMMON>                                       262,415                 335,624                 335,758
<OTHER-SE>                                    (91,300)                (93,678)                (95,469)
<TOTAL-LIABILITY-AND-EQUITY>                   411,387<F3>             529,969<F6>             545,974<F9>
<SALES>                                         12,803                  29,601                  47,559
<TOTAL-REVENUES>                                12,977                  29,964                  48,081
<CGS>                                            3,504                   8,140                  12,792
<TOTAL-COSTS>                                    3,504                   8,140                  12,792
<OTHER-EXPENSES>                                 4,385                   8,484                  13,010
<LOSS-PROVISION>                                   125                     246                     371
<INTEREST-EXPENSE>                               3,331                   8,056                  12,827
<INCOME-PRETAX>                                  1,636                   5,080                   9,191
<INCOME-TAX>                                         0                       0                       0
<INCOME-CONTINUING>                              1,636                   5,080                   9,191
<DISCONTINUED>                                       0                       0                       0
<EXTRAORDINARY>                                   (52)                    (52)                    (52)
<CHANGES>                                            0                       0                       0
<NET-INCOME>                                     1,584                   5,028                   9,139
<EPS-PRIMARY>                                      .09                     .25                     .43
<EPS-DILUTED>                                      .09                     .25                     .42
<FN>
<F1>Includes 2,382 of Investment in Unconsolidated Subsidiaries.
<F2>Also includes 7,906 of Other Assets and 4,992 of Receivable-Net.
<F3>Includes 456 of Minority Interest.
<F4>Includes 2,387 of Investment in Unconsolidated Subsidiaries.
<F5>Also includes 9,094 of Other Assets and 5,008 of Receivable-Net.
<F6>Includes 457 of Minority Interest.
<F7>Includes 4,182 of Investment in Unconsolidated Subsidiaries.
<F8>Also includes 9,801 of Other Assets and 7,011 of Receivable-Net.
<F9>Includes 501 of Minority Interest.
</FN>
        

</TABLE>