<ARTICLE> 5 <MULTIPLIER> 1,000 <CURRENCY> U.S. DOLLARS <PERIOD-TYPE> 12-MOS <FISCAL-YEAR-END> DEC-31-1997 <PERIOD-START> JAN-01-1997 <PERIOD-END> DEC-31-1997 <EXCHANGE-RATE> 1 <CASH> 55,601 <SECURITIES> 10,649 <RECEIVABLES> 56,792 <ALLOWANCES> 0 <INVENTORY> 27,929 <CURRENT-ASSETS> 168,502 <PP&E> 245,153 <DEPRECIATION> (86,483) <TOTAL-ASSETS> 567,214 <CURRENT-LIABILITIES> 101,921 <BONDS> 168,424 <PREFERRED-MANDATORY> 0 <PREFERRED> 0 <COMMON> 2,522 <OTHER-SE> 181,165 <TOTAL-LIABILITY-AND-EQUITY> 567,214 <SALES> 0 <TOTAL-REVENUES> 330,516 <CGS> 0 <TOTAL-COSTS> 282,789 <OTHER-EXPENSES> (21,045) <LOSS-PROVISION> 0 <INTEREST-EXPENSE> 11,395 <INCOME-PRETAX> 57,377 <INCOME-TAX> 27,664 <INCOME-CONTINUING> 29,713 <DISCONTINUED> (547) <EXTRAORDINARY> 0 <CHANGES> 0 <NET-INCOME> 29,166 <EPS-PRIMARY> 1.170 <EPS-DILUTED> 1.140