INCENTIVE PLANS (Tables)

12 Months Ended

Dec. 31, 2020

Aggregate Values for Distributed Restricted Share Awards

in thousands	2020	2019	2018
Aggregate value of distributed
restricted shares	$       12,210	$         2,417	$         1,345

Weighted-Average Fair Value and Weighted-Average Assumptions Used in Estimating Fair Value of Grants

	2020	2019	2018
SOSARs
Fair value	$        40.91	$        38.90	$        43.72
Risk-free interest rate	1.50%	2.62%	2.90%
Dividend yield	0.71%	0.87%	1.39%
Volatility	25.74%	27.23%	31.49%
Expected term (years)	9.00	9.00	9.00

Aggregate Intrinsic Values of Options Exercised

in thousands	2020	2019	2018
Aggregate intrinsic value of SOSARs exercised	$       22,273	$       74,838	$       49,248

Performance Shares [Member]

Summary of Activity For Nonvested Performance Share Units

	Target	Weighted-average
	Number	Grant Date
	of Shares	Fair Value
Performance Shares
Nonvested at January 1, 2020	244,904	$           113.55
Granted	117,740	133.95
Vested	(112,302)	117.19
Canceled/forfeited	(6,483)	120.66
Nonvested at December 31, 2020	243,859	$           121.53

Aggregate Value of Performance Shares

in thousands	2020	2019	2018
Aggregate value of distributed
performance shares	$       38,841	$       33,169	$       53,721

Restricted Shares [Member]

Summary of Restricted Stock Units

		Weighted-average
	Number	Grant Date
	of Shares	Fair Value
Restricted Stock Units
Nonvested at January 1, 2020	211,930	$           108.34
Granted	82,271	133.95
Vested	(86,302)	102.12
Canceled/forfeited	(7,746)	119.63
Nonvested at December 31, 2020	200,153	$           121.11

SOSARs [Member]

Summary of Our SOSAR Activity

			Weighted-average
			Remaining	Aggregate
	Number	Weighted-average	Contractual	Intrinsic Value
	of Shares	Exercise Price	Life (Years)	(in thousands)
SOSARs
Outstanding at January 1, 2020	944,599	$             76.84
Granted	75,300	133.95
Exercised	(229,993)	48.16
Forfeited or expired	(1,470)	43.05
Outstanding at December 31, 2020	788,436	$             90.72	5.03	$           44,106
Exercisable at December 31, 2020	641,613	$             82.84	4.23	$           40,949

Cash and Stock Consideration Received and Tax Benefit Realized from SOSAR Exercises and Compensation Cost Recorded

in thousands	2020	2019	2018
SOSARs
Cash and stock consideration received
from exercises	$              0	$              0	$              0
Tax benefit from exercises	5,693	29,000	19,083
Compensation cost	3,855	4,042	4,763