Stock Incentive Plans (Tables)

12 Months Ended

Dec. 31, 2019

Share-based Payment Arrangement [Abstract]

Schedule of information relating to options

The following table sets forth information relating to such options during 2019, 2018, and 2017.

	Number of Shares		Average Exercise Price		Weighted- Average Grant Date Fair Value
Balance, December 31, 2016	1,940,785		$	66.83
Options exercised	(386,300	)	45.21
Options forfeited	(34,545	)	72.97
Options terminated	(23,320	)	75.60
Options granted	316,830		71.37		$	13.00
Balance, December 31, 2017	1,813,450		72.04
Options exercised	(243,502	)	61.92
Options forfeited	(90,862	)	69.82
Options terminated	(33,481	)	75.07
Options granted	428,190		67.36		$	12.30
Balance, December 31, 2018	1,873,795		72.34
Options exercised	(388,174	)	74.33
Options forfeited	(35,216	)	71.21
Options terminated	(74,583	)	77.30
Options granted	189,787		78.11		$	17.94
Balance, December 31, 2019	1,565,609		72.30

Schedule of summary of non-vested option activity for the period

The following is a summary of nonvested option activity for the year ended December 31, 2019.

	Number Of Shares		Weighted- Average Grant Date Fair Value
Nonvested options outstanding at beginning of year	664,363		$	12.88
Granted	189,787		17.94
Vested	(237,758	)	16.98
Forfeited	(109,799	)	19.25
Nonvested options outstanding at end of year	506,593		14.81

Schedule of stock options outstanding and exercisable by exercise price range

A summary of our stock options outstanding and exercisable at December 31, 2019, follows:

Exercise Price Range	Number Outstanding	Number Exercisable	Outstanding Weighted- Average Remaining Contractual Life (Years)	Exercisable Weighted- Average Exercise Price
$60 - $70	668,479	428,259	2.23	67.98
$70 - $80	897,130	630,757	2.66	75.59
	1,565,609	1,059,016

Schedule of the assumptions used for estimating the fair value of stock options granted during the period

The following summarizes the weighted average assumptions used for estimating the fair value of stock options granted during 2019, 2018, and 2017, respectively.

	2019	2018	2017
Expected volatility	22.7% - 23.1%	22.9% - 24.4%	23.8% - 25.1%
Weighted average expected volatility	23.0%	23.7%	24.8%
Expected term	5.5 - 6.5 years	3.0 - 6.5 years	3.0 - 4.0 years
Risk-free rate	2.58%	2.55%	1.66%
Dividend yield	1.4%	1.4%	1.2%

Disclosure of Share-based Compensation Arrangements by Share-based Payment Award [Table Text Block]

Restricted Stock and Performance Based Units    In 2019, the Company modified a majority of its 2017 and 2018 cash-settled LTIP awards to be stock-settled. The following is a summary of RSUs and PBUs awarded under the LTIP.

	2019		2018		2017
PBUs granted under the LTIP	88,174		93,216		115,158
RSUs granted under the LTIP	57,900		86,698		57,600
Shares covered by awards forfeited under the LTIP	17,323		44,279		16,395
Weighted average grant date fair value of PBUs	$78.11		$67.39		$71.37
Weighted average grant date fair value of RSUs	$76.91		$67.54		$71.37
Approximate percentage of awards expected to settle in common stock(1)	96	%	94	%	93	%
Approximate percentage of awards expected to settle in cash(1)	4	%	6	%	7	%

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(1)    Assumes full vesting.