<TABLE> <S> <C>

<PAGE>
<ARTICLE> 5
<RESTATED>

<S>                             <C>                     <C>                     <C>
<PERIOD-TYPE>                   12-MOS                   12-MOS                   12-MOS
<FISCAL-YEAR-END>                          DEC-31-1995             DEC-31-1996             DEC-31-1997
<PERIOD-START>                             JAN-01-1995             JAN-01-1996             JAN-01-1997
<PERIOD-END>                               DEC-31-1995             DEC-31-1996             DEC-31-1997
<CASH>                                               0              56,056,000              10,046,000
<SECURITIES>                                         0              12,045,000                       0
<RECEIVABLES>                                        0              75,145,000              99,931,000
<ALLOWANCES>                                         0              11,228,000              17,261,000
<INVENTORY>                                          0                       0                       0
<CURRENT-ASSETS>                                     0             152,126,000             135,833,000
<PP&E>                                               0              70,532,000             101,422,000
<DEPRECIATION>                                       0              25,968,000              37,237,000
<TOTAL-ASSETS>                                       0             359,602,000             436,423,000
<CURRENT-LIABILITIES>                                0              35,655,000              97,004,000
<BONDS>                                              0              99,089,000              98,103,000
<PREFERRED-MANDATORY>                                0                       0                       0
<PREFERRED>                                          0                       0                       0
<COMMON>                                             0                 373,000                 388,000
<OTHER-SE>                                           0             208,746,000             223,535,000
<TOTAL-LIABILITY-AND-EQUITY>                         0             359,602,000             436,423,000
<SALES>                                              0                       0                       0
<TOTAL-REVENUES>                           283,041,000             349,687,000             458,952,000
<CGS>                                                0                       0                       0
<TOTAL-COSTS>                              229,899,000             277,839,000             357,430,000
<OTHER-EXPENSES>                            30,401,000              34,640,000              80,098,000
<LOSS-PROVISION>                             4,499,000               6,619,000              18,121,000
<INTEREST-EXPENSE>                           5,499,000               2,831,000               8,972,000
<INCOME-PRETAX>                             17,494,000              34,400,000              13,686,000
<INCOME-TAX>                                 7,633,000              13,266,000              10,849,000
<INCOME-CONTINUING>                          9,861,000              21,134,000               2,837,000
<DISCONTINUED>                                       0                       0                       0
<EXTRAORDINARY>                              3,140,000                       0                       0
<CHANGES>                                            0                       0                       0
<NET-INCOME>                                 6,721,000              21,134,000               2,837,000
<EPS-PRIMARY>                                     0.23                    0.59                    0.07
<EPS-DILUTED>                                     0.22                    0.57                    0.07


</TABLE>