<ARTICLE> 5
<MULTIPLIER>   1,000     
       
                                                                                                        
<PERIOD-TYPE>                  3-MOS                 3-MOS                 6-MOS                 9-MOS                 12-MOS
<FISCAL-YEAR-END>              DEC-31-1998           DEC-31-1997           DEC-31-1997           DEC-31-1997           DEC-31-1997
<PERIOD-END>                   MAR-31-1998           MAR-31-1997           JUN-30-1997           SEP-30-1997           DEC-31-1997
<CASH>                                  17                    64                    58                    64                    32
<SECURITIES>                             0                     0                     0                     0                     0
<RECEIVABLES>                      124,185               111,750               105,047               139,885               134,828
<ALLOWANCES>                       (5,657)              (10,212)               (8,193)               (8,002)               (4,014)
<INVENTORY>                              0                     0                     0                     0                     0
<CURRENT-ASSETS>                    18,175                55,893                56,251                57,748                11,894
<PP&E>                              58,208                64,194                65,644                66,588                55,585
<DEPRECIATION>                    (32,601)              (30,077)              (33,116)              (36,003)              (30,125)
<TOTAL-ASSETS>                     359,174               443,724               418,212               438,818               382,286
<CURRENT-LIABILITIES>               50,527                48,014                49,806                55,437                59,465
<BONDS>                                  0                     0                     0                     0                     0
<PREFERRED-MANDATORY>                    0                     0                     0                     0                     0
<PREFERRED>                              0                     0                     0                     0                     0
<COMMON>                            12,002                12,002                12,002                12,002                12,002
<OTHER-SE>                         233,885               316,798               289,494               304,469               246,673
<TOTAL-LIABILITY-AND-EQUITY>       359,174               443,724               418,212               438,818               382,286
<SALES>                                  0                     0                     0                     0                     0
<TOTAL-REVENUES>                    24,344                20,200                80,664               143,392               239,865
<CGS>                                    0                     0                     0                     0                     0
<TOTAL-COSTS>                        4,098                22,490                73,165                89,060               105,126
<OTHER-EXPENSES>                         0                     0                     0                     0               (9,412)
<LOSS-PROVISION>                         0                     0                     0                     0                     0
<INTEREST-EXPENSE>                       0                     0                     0                     0                     0
<INCOME-PRETAX>                     20,246               (2,290)                 7,499                54,332               144,151
<INCOME-TAX>                       (8,098)                   916               (3,000)              (21,733)              (59,246)
<INCOME-CONTINUING>                 12,148               (1,374)                 4,499                32,599                84,905
<DISCONTINUED>                           0                     0                     0                     0                     0
<EXTRAORDINARY>                          0                     0                     0                     0                     0
<CHANGES>                                0                     0                     0                     0                     0
<NET-INCOME>                        12,148               (1,374)                 4,499                32,599                84,905
<EPS-PRIMARY>                         0.07                (0.01)                  0.02                  0.18                  0.50
<EPS-DILUTED>                         0.07                (0.01)                  0.02                  0.18                  0.50