<TABLE> <S> <C>

<PAGE>
<ARTICLE> 5
<MULTIPLIER> 1,000

<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-31-1996
<PERIOD-START>                             JAN-01-1997             JAN-01-1997             JAN-01-1997             JAN-01-1996
<PERIOD-END>                               MAR-31-1997             JUN-30-1997             SEP-30-1997             DEC-31-1996
<CASH>                                          19,639                  19,008                   9,466                   6,888
<SECURITIES>                                         0                       0                       0                       0
<RECEIVABLES>                                    8,915                  15,185                  17,079                  11,534
<ALLOWANCES>                                         0                       0                       0                       0
<INVENTORY>                                          0                       0                       0                       0
<CURRENT-ASSETS>                                     0                       0                       0                       0
<PP&E>                                           2,679                   2,661                   3,493                   4,304
<DEPRECIATION>                                       0                       0                       0                  (1,966)
<TOTAL-ASSETS>                                 468,694                 518,216                 532,388                 407,291
<CURRENT-LIABILITIES>                           38,919                  29,227                  22,486                  26,622
<BONDS>                                              0                       0                       0                       0
<PREFERRED-MANDATORY>                                0                       0                       0                       0
<PREFERRED>                                          0                       0                       0                       0
<COMMON>                                        38,178                  37,890                  37,974                  37,658
<OTHER-SE>                                      28,210                  30,421                  33,606                  25,898
<TOTAL-LIABILITY-AND-EQUITY>                   468,694                 518,216                 532,388                 407,291
<SALES>                                              0                       0                       0                       0
<TOTAL-REVENUES>                                46,929                 102,826                 161,282                 144,596
<CGS>                                           32,245                  70,562                 109,365                  96,256
<TOTAL-COSTS>                                        0                       0                       0                       0
<OTHER-EXPENSES>                                 3,812                   8,417                  13,415                  12,300
<LOSS-PROVISION>                                     0                       0                       0                       0
<INTEREST-EXPENSE>                               6,219                  13,641                  21,851                  19,018
<INCOME-PRETAX>                                  4,338                   9,497                  15,487                  15,922
<INCOME-TAX>                                     1,813                   3,979                   6,484                   6,549
<INCOME-CONTINUING>                                  0                       0                       0                       0
<DISCONTINUED>                                       0                       0                       0                       0
<EXTRAORDINARY>                                      0                       0                       0                       0
<CHANGES>                                            0                       0                       0                       0
<NET-INCOME>                                     2,525                   5,518                   9,003                   9,373
<EPS-PRIMARY>                                     0.31                    0.67                    1.10                    1.19
<EPS-DILUTED>                                     0.30                    0.66                    1.08                    1.16


</TABLE>