<ARTICLE> 5
<RESTATED>
       
                                                                       
<PERIOD-TYPE>                   3-MOS                   6-MOS                   9-MOS
<FISCAL-YEAR-END>                          DEC-31-1997             DEC-31-1997             DEC-31-1997
<PERIOD-END>                               MAR-31-1997             JUN-30-1997             SEP-30-1997
<CASH>                                          14,872                  14,308                   8,563
<SECURITIES>                                         0                       0                       0
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<DEPRECIATION>                                  75,589                  83,863                  92,549
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<CURRENT-LIABILITIES>                                0                       0                       0
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<PREFERRED-MANDATORY>                                0                       0                       0
<PREFERRED>                                          0                       0                       0
<COMMON>                                           368                     366                     366
<OTHER-SE>                                     703,672                 701,342                 698,152
<TOTAL-LIABILITY-AND-EQUITY>                 1,301,981               1,373,692               1,417,179
<SALES>                                              0                       0                       0
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<CGS>                                                0                       0                       0
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<OTHER-EXPENSES>                                     0                       0                       0
<LOSS-PROVISION>                                     0                       0                       0
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<INCOME-TAX>                                         0                       0                       0
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<DISCONTINUED>                                       0                       0                       0
<EXTRAORDINARY>                                      0                       0                 (3,583)
<CHANGES>                                            0                       0                       0
<NET-INCOME>                                    16,459                  34,484                  48,859
<EPS-PRIMARY>                                     0.45                    0.95                    1.34
<EPS-DILUTED>                                     0.44                    0.93                    1.32