INCENTIVE PLANS (Tables)

12 Months Ended

Dec. 31, 2017

Aggregate Values For Distributed Restricted Share Awards

in thousands	2017	2016	2015
Aggregate value of distributed
restricted shares	$        7,685	$               0	$               0

Weighted-Average Fair Value And Weighted-Average Assumptions Used In Estimating Fair Value of Grants

	2017	2016	2015
SOSARs
Fair value	$        43.01	$        29.20	$        25.17
Risk-free interest rate	2.36%	1.66%	1.85%
Dividend yield	1.27%	1.39%	1.70%
Volatility	31.35%	30.42%	33.00%
Expected term	9.00 years	9.00 years	8.00 years

Summary of Our Stock Option/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, 2017	2,392,431	$             51.80
Granted	79,200	122.60
Exercised	(226,280)	64.75
Forfeited or expired	(2,864)	74.62
Outstanding at December 31, 2017	2,242,487	$             52.95	3.73	$         169,034
Vested and expected to vest	2,233,801	$             52.89	3.72	$         168,513
Exercisable at December 31, 2017	1,957,871	$             47.27	3.14	$         158,700

Aggregate Intrinsic Values of Options Exercised

in thousands	2017	2016	2015
Aggregate intrinsic value of SOSARs/
stock options exercised	$       13,758	$       27,705	$       43,620

Cash and Stock Consideration Received and Tax Benefit Realized from Stock Option/Sosar Exercises and Compensation Cost Recorded

in thousands	2017	2016	2015
SOSARs/Stock Options
Cash and stock consideration received
from exercises	$              0	$              0	$     72,884
Tax benefit from exercises	5,331	10,767	16,920
Compensation cost	3,723	2,744	2,221

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, 2017	667,096	$             73.20
Granted	121,310	117.49
Vested	(275,899)	63.42
Canceled/forfeited	(13,528)	80.97
Nonvested at December 31, 2017	498,979	$             89.16

Aggregate Value of Performance Shares

in thousands	2017	2016	2015
Aggregate value of distributed
performance shares	$       52,368	$       60,443	$       26,258

Restricted Shares [Member]

Summary of Restricted Stock Units

		Weighted-average
	Number	Grant Date
	of Shares	Fair Value
Restricted Stock Units
Nonvested at January 1, 2017	135,430	$             71.63
Granted	43,710	117.49
Vested	(64,544)	56.74
Canceled/forfeited	(5,294)	99.00
Nonvested at December 31, 2017	109,302	$             97.43