<TABLE> <S> <C>

<PAGE>
<ARTICLE> 5
<LEGEND>
THIS SCHEDULE CONTAINS SUMMARY FINANCIAL INFORMATION EXTRACTED FROM THE
FINANCIAL STATEMENTS AS OF AND FOR THE QUARTERS ENDED MARCH 31, 1997, JUNE 30,
1997 AND SEPTEMBER 30, 1997 AND IS QUALIFIED IN ITS ENTIRETY BY REFERENCE TO
SUCH FINANCIAL STATEMENTS.
</LEGEND>
<RESTATED>
<MULTIPLIER> 1,000

<S>                             <C>                     <C>                     <C>
<PERIOD-TYPE>                   3-MOS                   3-MOS                   3-MOS
<FISCAL-YEAR-END>                          DEC-31-1997             DEC-31-1997             DEC-31-1997
<PERIOD-START>                             JAN-01-1997             JAN-01-1997             JAN-01-1997
<PERIOD-END>                               MAR-31-1997             JUN-30-1997             SEP-30-1997
<CASH>                                          15,476                  11,866                   7,017
<SECURITIES>                                         0                       0                       0
<RECEIVABLES>                                   23,352                  28,985                  31,923
<ALLOWANCES>                                     3,037                   2,499                   2,788
<INVENTORY>                                          0                       0                       0
<CURRENT-ASSETS>                                41,518                  42,526                  38,994
<PP&E>                                          28,797                  29,233                  39,656
<DEPRECIATION>                                   8,093                   9,031                   9,587
<TOTAL-ASSETS>                                 493,812                 478,907                 475,138
<CURRENT-LIABILITIES>                           20,287                  21,864                  25,852
<BONDS>                                              0                       0                       0
<PREFERRED-MANDATORY>                                0                       0                       0
<PREFERRED>                                          0                       0                       0
<COMMON>                                            22                      22                      22
<OTHER-SE>                                     371,740                 377,222                 383,172
<TOTAL-LIABILITY-AND-EQUITY>                   493,812                 478,907                 475,138
<SALES>                                              0                       0                       0
<TOTAL-REVENUES>                                23,029                  61,010                  98,207
<CGS>                                                0                       0                       0
<TOTAL-COSTS>                                   20,357                  48,585                  74,976
<OTHER-EXPENSES>                                 1,729                   2,526                     319
<LOSS-PROVISION>                                     0                       0                       0
<INTEREST-EXPENSE>                               1,730                   2,618                   3,099
<INCOME-PRETAX>                                    943                   9,898                  19,813
<INCOME-TAX>                                       377                   3,959                   7,925
<INCOME-CONTINUING>                                566                   5,939                  11,888
<DISCONTINUED>                                       0                       0                       0
<EXTRAORDINARY>                                      0                       0                       0
<CHANGES>                                            0                       0                       0
<NET-INCOME>                                       566                   5,939                  11,888
<EPS-PRIMARY>                                     0.02                    0.15                    0.29
<EPS-DILUTED>                                     0.02                    0.15                    0.29


</TABLE>