WARNING: THE EDGAR SYSTEM ENCOUNTERED ERROR(S) WHILE PROCESSING THIS SCHEDULE.

<TABLE> <S> <C>

<PAGE>
<ARTICLE> 5
<LEGEND>
THIS SCHEDULE CONTAINS SUMMARY FINANCIAL INFORMATION EXTRACTED FROM MARCH 31,
1997 FORM 10-Q AND IS QUALIFIED IN ITS ENTIRETY BY REFERENCE TO SUCH FINANCIAL
STATEMENTS.
</LEGEND>
<MULTIPLIER> 1,000

<S>                             <C>                     <C>
<PERIOD-TYPE>                   3-MOS                   3-MOS
<FISCAL-YEAR-END>                          DEC-31-1997             DEC-31-1996
<PERIOD-START>                             JAN-01-1997             JAN-01-1996
<PERIOD-END>                               MAR-31-1997             MAR-31-1996
<CASH>                                           5,676                  10,613
<SECURITIES>                                     7,226                   4,139
<RECEIVABLES>                                   24,762                  26,922
<ALLOWANCES>                                     6,385                   7,168
<INVENTORY>                                      1,831                   2,863
<CURRENT-ASSETS>                                38,685                  43,753
<PP&E>                                          45,429                  45,619
<DEPRECIATION>                                  33,587                  32,054
<TOTAL-ASSETS>                                  58,249                  69,532
<CURRENT-LIABILITIES>                           39,305                  45,266
<BONDS>                                              0                       0
<PREFERRED-MANDATORY>                                0                       0
<PREFERRED>                                          0                       0
<COMMON>                                           194                     190
<OTHER-SE>                                      15,052                  20,132
<TOTAL-LIABILITY-AND-EQUITY>                    58,249                  69,532
<SALES>                                         16,378                  25,463
<TOTAL-REVENUES>                                20,031                  29,932
<CGS>                                            2,598                   2,698
<TOTAL-COSTS>                                   26,419                  29,583
<OTHER-EXPENSES>                                    32                      87
<LOSS-PROVISION>                                     0                       0
<INTEREST-EXPENSE>                                  24                      21
<INCOME-PRETAX>                                (6,302)                     576
<INCOME-TAX>                                        90                     207
<INCOME-CONTINUING>                            (6,392)                     369
<DISCONTINUED>                                       0                       0
<EXTRAORDINARY>                                      0                       0
<CHANGES>                                            0                       0
<NET-INCOME>                                   (6,392)                     369
<EPS-PRIMARY>                                   (0.37)                    0.02
<EPS-DILUTED>                                   (0.37)                    0.02



</TABLE>