<ARTICLE> 5
<MULTIPLIER> 1000
       

                               Exhibit 27(b)

                                                                
<PERIOD-TYPE>                  3-MOS          6-MOS          9-MOS          12-MOS
<FISCAL-YEAR-END>              DEC-31-1997    DEC-31-1997    DEC-31-1997    DEC-31-1997
<PERIOD-END>                   MAR-31-1997    JUN-30-1997    SEP-30-1997    DEC-31-1997
<CASH>                               78277         136546         163885          97617
<SECURITIES>                             0              0              0              0
<RECEIVABLES>                       570626         568480         674350         723940
<ALLOWANCES>                       (19824)        (19798)        (21169)        (20155)
<INVENTORY>                          32400          34287          36462          36580
<CURRENT-ASSETS>                    824666         889056        1000756        1009387
<PP&E>                             1295106        1333503        1396911        1496696
<DEPRECIATION>                    (532630)       (558954)       (587891)       (616854)
<TOTAL-ASSETS>                     2103137        2180344        2334974        2421496
<CURRENT-LIABILITIES>               811242         718657         824624         806138
<BONDS>                             473642         473528         473508         473488
<PREFERRED-MANDATORY>                    0         125000         125000         125000
<PREFERRED>                         132691         132136         131877         131658
<COMMON>                            291056         303794         310180         336237
<OTHER-SE>                          109143         136643         167338         190208
<TOTAL-LIABILITY-AND-EQUITY>       2103137        2180344        2334974        2421496
<SALES>                                  0              0              0              0
<TOTAL-REVENUES>                    942628        1945191        3072553        4266801
<CGS>                                    0              0              0              0
<TOTAL-COSTS>                       892261        1827957        2873472        4001934
<OTHER-EXPENSES>                     10195          22035          31139          43053
<LOSS-PROVISION>                         0              0              0              0
<INTEREST-EXPENSE>                   10805          21067          29882          39553
<INCOME-PRETAX>                      40172          95199         167942         221814
<INCOME-TAX>                         18228          43266          76364         100925
<INCOME-CONTINUING>                  21944          51933          91578         120889
<DISCONTINUED>                           0              0              0              0
<EXTRAORDINARY>                          0              0              0              0
<CHANGES>                                0              0              0              0
<NET-INCOME>                         20005          48023          85717         113003
<EPS-PRIMARY>                          .44          1.03           1.79           2.44
<EPS-DILUTED>                          .40            .95           1.65           2.19