<ARTICLE> 5
<LEGEND>
This Filing of the Article 5 EX-27 Financial Data Schedule is only a
summarization of some of the information provided in the actual 10-Q
itself.  It is meant as a supplement to the 10-Q filed electronically in
order to satisfy the requirements for EDGAR filers only and is not meant
to be a substitute for the 10-Q filing as required by the S.E.C.
</LEGEND>
       
                             
<PERIOD-TYPE>                   6-MOS
<FISCAL-YEAR-END>                          DEC-31-1995
<PERIOD-END>                               JUN-30-1995
<CASH>                                       2,260,000
<SECURITIES>                               221,208,000
<RECEIVABLES>                               66,552,000
<ALLOWANCES>                                 1,439,000
<INVENTORY>                                  8,735,000
<CURRENT-ASSETS>                           305,133,000
<PP&E>                                     847,534,000
<DEPRECIATION>                            (360,621,000)
<TOTAL-ASSETS>                             833,079,000
<CURRENT-LIABILITIES>                       84,272,000
<BONDS>                                              0
<COMMON>                                     3,136,000
<PREFERRED-MANDATORY>                                0
<PREFERRED>                                          0
<OTHER-SE>                                 593,437,000
<TOTAL-LIABILITY-AND-EQUITY>               833,079,000
<SALES>                                    157,225,000
<TOTAL-REVENUES>                           161,962,000
<CGS>                                        8,994,000
<TOTAL-COSTS>                              100,639,000
<OTHER-EXPENSES>                                     0
<LOSS-PROVISION>                                     0
<INTEREST-EXPENSE>                           1,479,000
<INCOME-PRETAX>                             61,323,000
<INCOME-TAX>                                20,246,000
<INCOME-CONTINUING>                                  0
<DISCONTINUED>                                       0
<EXTRAORDINARY>                                      0
<CHANGES>                                            0
<NET-INCOME>                                41,077,000
<EPS-PRIMARY>                                     1.31
<EPS-DILUTED>                                     1.31