<ARTICLE> 5
<LEGEND>
This schedule contains summary financial information extracted from the
Condensed Consolidated Statements of Financial Condition at June 30, 1998
June 30, 1997 (Unaudited) and the Condensed Consolidated Statements of Income
for the six Months Ended June 30, 1998 and June 30, 1997 (Unaudited) and is
qualified in its entirety by reference to such financial statements.
</LEGEND>
<MULTIPLIER> 1,000
       
                                                  
<PERIOD-TYPE>                   6-MOS                   6-MOS
<FISCAL-YEAR-END>                          DEC-31-1998             DEC-31-1997
<PERIOD-START>                             JAN-01-1998             JAN-01-1997
<PERIOD-END>                               JUN-30-1998             JUN-30-1997
<CASH>                                          37,235                  40,646
<SECURITIES>                                     6,090                   5,829
<RECEIVABLES>                                  229,865                 200,014
<ALLOWANCES>                                    13,359                  12,441
<INVENTORY>                                     57,194                  35,617
<CURRENT-ASSETS>                               332,493                 285,504
<PP&E>                                         297,032                 277,988
<DEPRECIATION>                                 151,875                 139,055
<TOTAL-ASSETS>                                 586,962                 500,653
<CURRENT-LIABILITIES>                          137,614                 120,639
<BONDS>                                              0                       0
<PREFERRED-MANDATORY>                                0                       0
<PREFERRED>                                          0                       0
<COMMON>                                           198                     196
<OTHER-SE>                                     385,129                 358,404
<TOTAL-LIABILITY-AND-EQUITY>                   586,962                 500,653
<SALES>                                        413,613                 347,524
<TOTAL-REVENUES>                               413,613                 384,085
<CGS>                                          216,773                 192,064
<TOTAL-COSTS>                                  216,773                 192,064
<OTHER-EXPENSES>                                   141                       0
<LOSS-PROVISION>                                 4,682                   3,761
<INTEREST-EXPENSE>                                 980                     659
<INCOME-PRETAX>                                 48,828                  80,178
<INCOME-TAX>                                    20,423                  34,241
<INCOME-CONTINUING>                                  0                       0
<DISCONTINUED>                                       0                       0
<EXTRAORDINARY>                                      0                       0
<CHANGES>                                            0                       0
<NET-INCOME>                                    28,405                  45,937
<EPS-PRIMARY>                                     1.55                    2.55
<EPS-DILUTED>                                     1.50                    2.48