<ARTICLE> 5 <LEGEND> This schedule contains financial information extracted from SEC filing Form 10-K and is qualified in its entirety by reference to such financial statements. </LEGEND> <MULTIPLIER> 1,000 <PERIOD-TYPE> 12-MOS <FISCAL-YEAR-END> DEC-31-1997 <PERIOD-START> JAN-01-1997 <PERIOD-END> DEC-31-1997 <CASH> $8,671 <SECURITIES> 0 <RECEIVABLES> 97,374 <ALLOWANCES> 2,162 <INVENTORY> 7,758 <CURRENT-ASSETS> 122,795 <PP&E> 571,422 <DEPRECIATION> 246,236 <TOTAL-ASSETS> 853,781 <CURRENT-LIABILITIES> 0 <BONDS> 0 <PREFERRED-MANDATORY> 0 <PREFERRED> 0 <COMMON> 0 <OTHER-SE> 0 <TOTAL-LIABILITY-AND-EQUITY> 0 <SALES> 641,950 <TOTAL-REVENUES> 641,950 <CGS> 0 <TOTAL-COSTS> 526,195 <OTHER-EXPENSES> (9,203) <LOSS-PROVISION> 0 <INTEREST-EXPENSE> 8,698 <INCOME-PRETAX> 116,260 <INCOME-TAX> 47,461 <INCOME-CONTINUING> 68,799 <DISCONTINUED> 0 <EXTRAORDINARY> 0 <CHANGES> 0 <NET-INCOME> $68,799 <EPS-PRIMARY> $1.81 <EPS-DILUTED> $1.80