<TABLE> <S> <C>

<PAGE>
<ARTICLE> 5
<RESTATED> 
<MULTIPLIER> 1,000
       
<S>                             <C>                     <C>                     <C>                     <C>
<PERIOD-TYPE>                   YEAR                   3-MOS                   3-MOS                   3-MOS
<FISCAL-YEAR-END>                          DEC-31-1996             DEC-31-1996             DEC-31-1996             DEC-31-1996
<PERIOD-START>                             JAN-01-1996             JAN-01-1996             APR-01-1996             JUL-01-1996
<PERIOD-END>                               DEC-31-1996             MAR-31-1996             JUN-30-1996             SEP-30-1996
<CASH>                                          86,177                      14                  10,984                   2,083
<SECURITIES>                                         0                       0                       0                       0
<RECEIVABLES>                                   19,213                  14,583                  15,772                  18,493
<ALLOWANCES>                                     (785)                   (513)                   (541)                   (784)
<INVENTORY>                                          0                       0                       0                       0
<CURRENT-ASSETS>                               106,540                  16,765                  28,386                  22,446
<PP&E>                                         234,265                 169,009                 192,211                 209,830
<DEPRECIATION>                                (70,108)                (48,911)                (55,443)                (61,111)
<TOTAL-ASSETS>                                 279,768                 139,469                 167,611                 174,368
<CURRENT-LIABILITIES>                           21,796                  24,834                  26,671                  28,193
<BONDS>                                        179,233                  73,133                  58,147                  63,847
<PREFERRED-MANDATORY>                                0                       0                       0                       0
<PREFERRED>                                          0                       0                       0                       0
<COMMON>                                           111                      74                     110                     110
<OTHER-SE>                                      75,441                  39,826                  81,020                  79,166
<TOTAL-LIABILITY-AND-EQUITY>                   279,768                 139,469                 167,611                 174,368
<SALES>                                         97,721                  20,368                  23,202                  27,116
<TOTAL-REVENUES>                                97,721                  20,368                  23,202                  27,116
<CGS>                                           44,379                   9,114                  10,422                  12,691
<TOTAL-COSTS>                                   58,428                  12,185                  14,095                  14,504
<OTHER-EXPENSES>                                     0                       0                       0                       0
<LOSS-PROVISION>                                     0                       0                       0                       0
<INTEREST-EXPENSE>                               8,243                   1,922                   2,078                   1,769
<INCOME-PRETAX>                               (13,329)                 (2,853)                 (3,393)                 (1,848)
<INCOME-TAX>                                        28                      20                       2                       9
<INCOME-CONTINUING>                           (13,357)                 (2,873)                 (3,395)                 (1,857)
<DISCONTINUED>                                       0                       0                       0                       0
<EXTRAORDINARY>                                  3,253                       0                       0                       0
<CHANGES>                                            0                       0                       0                       0
<NET-INCOME>                                  (16,610)                 (2,873)                 (3,395)                 (1,857)
<EPS-PRIMARY>                                   (1.74)                   (.39)                   (.39)                   (.17)
<EPS-DILUTED>                                        0                       0                       0                       0
        

</TABLE>