<TABLE> <S> <C>

<PAGE>
<ARTICLE> 5
<LEGEND>
This schedule contains summary financial information extracted from the
consolidated balance sheet and consolidated statements of operations on pages 1
and 2 of the Company's 1997 Form 10-Q for the three months ended June 30, 1997,
and is qualified in its entirety by reference to such financial statements.
</LEGEND>
<MULTIPLIER> 1,000
       
<S>                                        <C>                     <C>
<PERIOD-TYPE>                                    3-MOS                   6-MOS
<FISCAL-YEAR-END>                          DEC-31-1997             DEC-31-1997
<PERIOD-START>                             APR-01-1997             JAN-01-1997
<PERIOD-END>                               JUN-30-1997             JUN-30-1997
<CASH>                                             186                       0
<SECURITIES>                                         0                       0
<RECEIVABLES>                                    8,562                       0
<ALLOWANCES>                                         0                       0
<INVENTORY>                                      2,920                       0
<CURRENT-ASSETS>                                13,817                       0
<PP&E>                                          69,166                       0
<DEPRECIATION>                                (13,830)                       0
<TOTAL-ASSETS>                                  79,078                       0
<CURRENT-LIABILITIES>                            7,676                       0
<BONDS>                                         10,026                       0
<PREFERRED-MANDATORY>                                0                       0
<PREFERRED>                                          0                       0
<COMMON>                                            85                       0
<OTHER-SE>                                      48,095                       0
<TOTAL-LIABILITY-AND-EQUITY>                    79,078                       0
<SALES>                                         10,820                  38,567
<TOTAL-REVENUES>                                12,030                  40,725
<CGS>                                            6,076                  23,047
<TOTAL-COSTS>                                    6,076                  23,047
<OTHER-EXPENSES>                                 5,501                  10,510
<LOSS-PROVISION>                                     0                       0
<INTEREST-EXPENSE>                                 312                     335
<INCOME-PRETAX>                                    473                   7,391
<INCOME-TAX>                                       173                   2,809
<INCOME-CONTINUING>                                300                   4,582
<DISCONTINUED>                                       0                       0
<EXTRAORDINARY>                                      0                       0
<CHANGES>                                            0                       0
<NET-INCOME>                                       300                   4,582
<EPS-PRIMARY>                                      .04                     .54
<EPS-DILUTED>                                        0                       0
        

</TABLE>