Exhibit 11

                        Earnings Per Share Computations
                 (thousands of dollars, except per share data)



                                                              For the Three Months         For the Six Months
                                                                 Ended June 30,              Ended June 30,
                                                               1997          1996          1997          1996
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PRIMARY EARNINGS PER SHARE
Earnings available for common shares and common stock     
  equivalent shares deemed to have a dilutive effect:
  Earnings from operations...........................     $    12,233         11,661          24,381       23,227
  Provision for cash dividends on preferred
    stock (Series B).................................             --          (1,061)                      (2,121)
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Net earnings available for common shares and
  common stock equivalent shares deemed to have
  a dilutive effect..................................     $    12,233         10,600          24,381       21,106
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Primary earnings per share...........................     $      0.93           0.80            1.80         1.56
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SHARES USED IN COMPUTATION
Weighted average common shares outstanding 
  (net of treasury shares)...........................      13,029,829     13,147,457      13,352,949   13,332,060
Common stock equivalents.............................         179,943        181,074         184,368      182,736
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Total common shares and common stock equivalent
  shares deemed to have a dilutive effect............      13,209,772     13,328,531      13,537,317   13,514,796
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FULLY DILUTED EARNINGS PER SHARE
Net earnings available for common shares and
  common stock equivalent shares deemed to have
  a dilutive effect..................................     $    12,233         11,661          24,381       23,227
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Fully diluted earnings per share.....................     $      0.92           0.76            1.79         1.50
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SHARES USED IN COMPUTATION
Total common shares and common stock equivalent
  shares deemed to have a dilutive effect............      13,209,772     13,328,531      13,537,317   13,514,796
Additional potentially dilutive securities
  (equivalent in common stock):
    Convertible preferrred stock (Series B)..........            --        1,959,268          61,994    1,959,268
    Stock options....................................          18,239            827          38,910        1,153
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      Total..........................................      13,228,011     15,288,626      13,638,221   15,475,217
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SUMMARY OF CASH DIVIDENDS DECLARED PER SHARE
Preferred-Series B...................................     $      --              .42            --            .84
Common...............................................             .34            .30             .68          .60