WARNING: THE EDGAR SYSTEM ENCOUNTERED ERROR(S) WHILE PROCESSING THIS SCHEDULE.

  


<ARTICLE>                     5
<LEGEND>
This  schedule  contains  summary  financial   information  extracted  from  the
consolidated   balance  sheet,   consolidated   statement  of  operations,   and
consolidated statement of cash flows included in the Company's Form 10-Q for the
period  ending June 30,  1998,  and is qualified in its entirety by reference to
such financial statements.
</LEGEND>

<MULTIPLIER>                             $ 1,000
       
                              
<PERIOD-TYPE>                  6-MOS
<FISCAL-YEAR-END>                        Dec-31-1998
<PERIOD-START>                           Jan-01-1998
<PERIOD-END>                             Jun-01-1998
<CASH>                                         6,697
<SECURITIES>                                  70,996
<RECEIVABLES>                                 11,355
<ALLOWANCES>                                       0
<INVENTORY>                                        0
<CURRENT-ASSETS>                              21,509
<PP&E>                                        69,807
<DEPRECIATION>                                37,034
<TOTAL-ASSETS>                               133,572
<CURRENT-LIABILITIES>                         21,667
<BONDS>                                       33,194
<PREFERRED-MANDATORY>                              0
<PREFERRED>                                        0
<COMMON>                                          38
<OTHER-SE>                                    78,673
<TOTAL-LIABILITY-AND-EQUITY>                 133,572
<SALES>                                       13,159
<TOTAL-REVENUES>                              43,885
<CGS>                                          7,790
<TOTAL-COSTS>                                 40,643
<OTHER-EXPENSES>                                   0
<LOSS-PROVISION>                                   0
<INTEREST-EXPENSE>                             1,292
<INCOME-PRETAX>                               11,627
<INCOME-TAX>                                       0
<INCOME-CONTINUING>                           11,627
<DISCONTINUED>                                     0
<EXTRAORDINARY>                                    0
<CHANGES>                                          0
<NET-INCOME>                                  11,627
<EPS-PRIMARY>                                   0.31
<EPS-DILUTED>                                   0.30