<ARTICLE> 5 <MULTIPLIER> 1,000 <PERIOD-TYPE> 9-MOS <FISCAL-YEAR-END> DEC-31-1995 <PERIOD-START> JAN-01-1996 <PERIOD-END> SEP-30-1996 <CASH> 41 <SECURITIES> 0 <RECEIVABLES> 94,457 <ALLOWANCES> 3,325 <INVENTORY> 769 <CURRENT-ASSETS> 95,685 <PP&E> 941,340 <DEPRECIATION> 661,019 <TOTAL-ASSETS> 396,969 <CURRENT-LIABILITIES> 67,437 <BONDS> 80,000 <PREFERRED-MANDATORY> 0 <PREFERRED> 0 <COMMON> 12,518 <OTHER-SE> 151,308 <TOTAL-LIABILITY-AND-EQUITY> 396,969 <SALES> 257,313 <TOTAL-REVENUES> 257,313 <CGS> 81,368 <TOTAL-COSTS> 152,144 <OTHER-EXPENSES> 0 <LOSS-PROVISION> 0 <INTEREST-EXPENSE> 5,834 <INCOME-PRETAX> 99,335 <INCOME-TAX> 43,704 <INCOME-CONTINUING> 55,631 <DISCONTINUED> 0 <EXTRAORDINARY> 0 <CHANGES> 0 <NET-INCOME> 55,631 <EPS-PRIMARY> 0 <EPS-DILUTED> 0