<TABLE> <S> <C>

<ARTICLE> 5
<RESTATED> 
       
<S>                               <C>                     <C>                     <C>                      <C>   
<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-START>                           JAN-01-1997            JAN-01-1997             JAN-01-1997               JAN-01-1997  
<PERIOD-END>                             MAR-31-1997            JUN-30-1997             SEP-30-1997               DEC-31-1997  
<CASH>                                        15,820                 10,556                   9,575                     9,261  
<SECURITIES>                                       0                      0                       0                         0  
<RECEIVABLES>                                 25,035                 27,822                  31,575                    32,349  
<ALLOWANCES>                                 (1,755)                (1,602)                 (2,370)                   (3,219)  
<INVENTORY>                                    1,190                  1,473                   1,493                     1,675  
<CURRENT-ASSETS>                              43,488                 41,418                  45,125                    45,777  
<PP&E>                                        29,181                 31,390                  36,946                    38,880  
<DEPRECIATION>                              (13,634)               (15,012)                (18,040)                  (17,829)  
<TOTAL-ASSETS>                               110,057                112,183                 121,353                   132,742  
<CURRENT-LIABILITIES>                         22,426                 18,787                  21,094                    23,065  
<BONDS>                                        5,368                  4,558                   4,660                     6,548  
<PREFERRED-MANDATORY>                              0                      0                       0                         0  
<PREFERRED>                                        0                      0                       0                         0  
<COMMON>                                         109                    111                     113                       117  
<OTHER-SE>                                    82,131                 88,106                  94,839                   102,247  
<TOTAL-LIABILITY-AND-EQUITY>                 110,057                112,183                 121,353                   132,742  
<SALES>                                        1,765                  3,590                   5,878                     7,845  
<TOTAL-REVENUES>                              37,078                 75,712                 119,979                   168,158  
<CGS>                                          1,351                  2,774                   4,527                     5,949  
<TOTAL-COSTS>                                 31,973                 65,072                 104,161                   145,373  
<OTHER-EXPENSES>                               (219)                  (381)                   (467)                     (594)  
<LOSS-PROVISION>                                   3                    100                     387                       560  
<INTEREST-EXPENSE>                               204                    404                     566                     1,890  
<INCOME-PRETAX>                                3,967                  8,230                  12,015                    16,148  
<INCOME-TAX>                                   1,570                  3,355                   4,869                     6,506  
<INCOME-CONTINUING>                            2,397                  4,875                   7,146                     9,642  
<DISCONTINUED>                                     0                      0                       0                         0  
<EXTRAORDINARY>                                    0                      0                       0                         0  
<CHANGES>                                          0                      0                       0                         0  
<NET-INCOME>                                   2,397                  4,875                   7,146                     9,642  
<EPS-PRIMARY>                                    .22                   0.45                    0.65                      0.86  
<EPS-DILUTED>                                    .22                   0.44                    0.64                      0.85  
        

</TABLE>