<TABLE> <S> <C>

<PAGE>
<ARTICLE> 5
<LEGEND>
This schedule contains summary financial information extracted from Form 10
Quarterly Report Pursuant to Section 13 or 15(d) of the Security
Exchange Act of 1934 for the quarterly period ended September 30, 1999 and is
qualified in its entirety by reference to such financial statements.
</LEGEND>
<MULTIPLIER> 1,000

<S>                             <C>                     <C>
<PERIOD-TYPE>                   3-MOS                   9-MOS
<FISCAL-YEAR-END>                          DEC-31-1999             DEC-31-1999
<PERIOD-START>                             JUL-01-1999             JAN-01-1999
<PERIOD-END>                               SEP-30-1999             SEP-30-1999
<CASH>                                          12,243                  12,243
<SECURITIES>                                         0                       0
<RECEIVABLES>                                    4,490                   4,490
<ALLOWANCES>                                      (50)                    (50)
<INVENTORY>                                          0                       0
<CURRENT-ASSETS>                                16,893                  16,893
<PP&E>                                         234,872                 234,872
<DEPRECIATION>                               (160,372)               (160,372)
<TOTAL-ASSETS>                                 105,944                 105,944
<CURRENT-LIABILITIES>                           14,340                  14,340
<BONDS>                                              0                       0
<PREFERRED-MANDATORY>                                0                       0
<PREFERRED>                                          0                       0
<COMMON>                                            87                      87
<OTHER-SE>                                      40,828                  40,828
<TOTAL-LIABILITY-AND-EQUITY>                   105,944                 105,944
<SALES>                                          7,194                  18,099
<TOTAL-REVENUES>                                 7,728                  19,593
<CGS>                                                0                       0
<TOTAL-COSTS>                                    7,731                  19,429
<OTHER-EXPENSES>                                   141                     142
<LOSS-PROVISION>                                     0                       0
<INTEREST-EXPENSE>                                 962                   2,821
<INCOME-PRETAX>                                  (921)                 (2,447)
<INCOME-TAX>                                     (551)                 (1,439)
<INCOME-CONTINUING>                                  0                       0
<DISCONTINUED>                                       0                       0
<EXTRAORDINARY>                                      0                       0
<CHANGES>                                            0                       0
<NET-INCOME>                                     (370)                 (1,008)
<EPS-BASIC>                                     (0.04)                  (0.12)
<EPS-DILUTED>                                   (0.04)                  (0.12)


</TABLE>