<ARTICLE> 5

                                                                       
<PERIOD-TYPE>                   3-MOS                   6-MOS                   9-MOS
<FISCAL-YEAR-END>                          DEC-31-2000             DEC-31-2000             DEC-31-2000
<PERIOD-START>                             JAN-01-2000             APR-01-2000             JUL-01-2000
<PERIOD-END>                               MAR-31-2000             JUN-30-2000             SEP-30-2000
<CASH>                                             950                     873                     871
<SECURITIES>                                         0                       0                       0
<RECEIVABLES>                                   65,493                  65,213                  67,900
<ALLOWANCES>                                   (6,561)                 (5,942)                 (5,863)
<INVENTORY>                                          0                       0                       0
<CURRENT-ASSETS>                                75,016                  74,615                  78,055
<PP&E>                                         291,025                 306,571                 325,504
<DEPRECIATION>                               (122,011)               (124,511)               (126,715)
<TOTAL-ASSETS>                                 258,721                 271,386                 291,966
<CURRENT-LIABILITIES>                           72,901                  59,286                  61,741
<BONDS>                                              0                       0                       0
<PREFERRED-MANDATORY>                                0                       0                       0
<PREFERRED>                                          0                       0                       0
<COMMON>                                           831                     831                     831
<OTHER-SE>                                     112,534                 117,110                 121,403
<TOTAL-LIABILITY-AND-EQUITY>                   258,721                 271,386                 291,966
<SALES>                                        112,799                 120,144                 122,385
<TOTAL-REVENUES>                               112,799                 120,144                 122,385
<CGS>                                                0                       0                       0
<TOTAL-COSTS>                                  108,076                 111,529                 114,125
<OTHER-EXPENSES>                                     9                      80                    (50)
<LOSS-PROVISION>                                     0                       0                       0
<INTEREST-EXPENSE>                                 899                   1,033                   1,273
<INCOME-PRETAX>                                  3,815                   7,502                   7,037
<INCOME-TAX>                                     1,488                   2,926                   2,744
<INCOME-CONTINUING>                              2,327                   4,576                   4,293
<DISCONTINUED>                                       0                       0                       0
<EXTRAORDINARY>                                      0                       0                       0
<CHANGES>                                            0                       0                       0
<NET-INCOME>                                     2,327                   4,576                   4,293
<EPS-BASIC>                                       0.28                     .55                     .52
<EPS-DILUTED>                                     0.28                     .55                     .52