<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,  1997,  and is qualified in its entirety by reference to
such financial statements.

</LEGEND>

<MULTIPLIER>                                   1,000
       

                                            
<PERIOD-TYPE>                                  6-MOS
<FISCAL-YEAR-END>                              Dec-31-1997
<PERIOD-START>                                 Jan-01-1997
<PERIOD-END>                                   Jun-30-1997
<CASH>                                          14,631
<SECURITIES>                                    57,259
<RECEIVABLES>                                    6,010
<ALLOWANCES>                                         0
<INVENTORY>                                          0
<CURRENT-ASSETS>                                37,993
<PP&E>                                          68,216
<DEPRECIATION>                                  32,162
<TOTAL-ASSETS>                                 127,403
<CURRENT-LIABILITIES>                           24,565
<BONDS>                                         30,714
<PREFERRED-MANDATORY>                                0
<PREFERRED>                                          0
<COMMON>                                            37
<OTHER-SE>                                      72,087
<TOTAL-LIABILITY-AND-EQUITY>                   127,403
<SALES>                                         13,696
<TOTAL-REVENUES>                                19,211
<CGS>                                            8,223
<TOTAL-COSTS>                                   43,973
<OTHER-EXPENSES>                                   179
<LOSS-PROVISION>                                     0
<INTEREST-EXPENSE>                                 884
<INCOME-PRETAX>                                (24,808)
<INCOME-TAX>                                         0
<INCOME-CONTINUING>                            (24,808)
<DISCONTINUED>                                       0
<EXTRAORDINARY>                                      0
<CHANGES>                                            0
<NET-INCOME>                                         0
<EPS-PRIMARY>                                    (0.69)
<EPS-DILUTED>                                    (0.69)