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Stock Compensation Plans (Tables)
12 Months Ended
Dec. 31, 2020
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Stock-Based Compensation Expense Included in Consolidated Statement of Income and Comprehensive Income Total stock-based compensation expense included in the Consolidated Statement of Income and Comprehensive Income was as follows: 
 December 31,
(DOLLARS IN THOUSANDS)202020192018
Equity-based awards$35,798 $34,482 $29,401 
Liability-based awards3,865 4,128 2,517 
Total stock-based compensation39,663 38,610 31,918 
Less tax benefit(7,381)(7,305)(6,556)
Total stock-based compensation, net of tax$32,282 $31,305 $25,362 
SSAR's and Stock Option Activity
SSARs and options activity was as follows: 
(SHARE AMOUNTS IN THOUSANDS)Shares Subject to
SSARs/Options
Weighted
Average Exercise
Price
SSARs/
Options
Exercisable
December 31, 201915 $138.73 
Granted27 133.10 
Exercised— — 
Canceled— — 
December 31, 202042 $135.01 
SSAR's and Stock Option Outstanding
SSARs and options outstanding at December 31, 2020 was as follows: 
Price RangeNumber
Outstanding
(in thousands)
Weighted Average
Remaining
Contractual Life
(in years)
Weighted
Average
Exercise Price
Aggregate
Intrinsic Value
(in thousands)
Over $11542 5.71$135.01 $— 
SSARs and options exercisable as of December 31, 2020 was as follows:
Price RangeNumber
Exercisable
(in thousands)
Weighted Average
Remaining
Contractual Life
(in years)
Weighted
Average
Exercise Price
Aggregate
Intrinsic Value
(in thousands)
Over $1151.34$118.10 $— 
SSAR's and Stock Option Exercisable
SSARs and options exercisable as of December 31, 2020 was as follows:
Price RangeNumber
Exercisable
(in thousands)
Weighted Average
Remaining
Contractual Life
(in years)
Weighted
Average
Exercise Price
Aggregate
Intrinsic Value
(in thousands)
Over $1151.34$118.10 $— 
RSU's [Member]  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
RSU, PRS and Cash RSU Activity
RSU activity was as follows:
Number of Shares
(in thousands)
Weighted Average
Grant Date Fair
Value Per Share
December 31, 2019497 $130.24 
Granted212 121.55 
Vested(161)130.99 
Forfeited(23)128.29 
December 31, 2020525 $126.62 
Restricted Stock [Member]  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
RSU, PRS and Cash RSU Activity
The following table summarizes the Company's PRSU activity for the years ended December 31, 2020, 2019 and 2018:
(DOLLARS IN MILLIONS)Issued SharesAggregate Purchase PriceCovered Shares
202066,160 $8.7 33,080 
201961,991 8.5 30,996 
201866,674 9.3 33,337 
PRSU activity was as follows: 
(SHARE AMOUNTS IN THOUSANDS)Number of
Shares
Weighted Average
Grant Date Fair
Value Per Share
December 31, 2019168 $138.96 
Granted66 131.31 
Vested(41)138.83 
Forfeited— — 
December 31, 2020193 $136.37 
Cash RSU's [Member]  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
RSU, PRS and Cash RSU Activity
Cash RSU activity was as follows:
(SHARE AMOUNTS IN THOUSANDS)Cash RSUsWeighted Average 
Fair
Value Per Share
December 31, 201995 $126.35 
Granted50 108.84 
Vested(30)131.93 
Forfeited(4)120.15 
December 31, 2020111 $108.84