Shareholders' Equity and Common Stock Equivalents (Tables)

12 Months Ended

Dec. 31, 2018

Equity [Abstract]

Summary of stock units and stock options outstanding under the Comprehensive Plan

As further described in the paragraphs below, CSUs, stock options and RSUs under the Comprehensive Plan were as follows:

	December 31,
	2018	2017	2016
CSUs related to deferred compensation for Directors	32,288	61,677	74,058
CSUs related to deferred compensation for employees	24,498	24,903	51,502
Stock options	774,821	719,015	747,032
RSUs related to incentive compensation	1,008,249	1,149,679	1,419,268
Total	1,839,856	1,955,274	2,291,860

Summary of changes in outstanding options

Changes in outstanding options were as follows:

	Weighted Average Option Price per Share	Range of Option Prices per Share	Options
			Outstanding		Vested and Exercisable
December 31, 2017	$32.80	$17.01-$41.95	719,015		258,321
Granted	$43.04	$42.95-$44.75	223,208		—
Vested	$31.42	$17.32-$41.95	—		158,233
Exercised	$27.07	$17.01-$41.95	(145,438	)	(145,438	)
Forfeited	$39.07	$31.01-$42.95	(21,964	)	—
Expired	—	—	—		—
December 31, 2018	$36.65	$17.32-$44.75	774,821		271,116

Summary of options outstanding segregated by ranges of exercise prices

Option information segregated by ranges of exercise prices was as follows:

	December 31, 2018
		Total Outstanding Options			Vested and Exercisable Options
	Range of Option Prices per Share	Options	Weighted Average Option Price per Share	Weighted Average Remaining Term	Options	Weighted Average Option Price per Share	Weighted Average Remaining Term
	$17.01-$22.69	36,524	$19.77	0.82	36,524	$19.77	0.82 years
	$28.88-$33.41	320,897	$31.01	6.68	183,685	$30.85	6.40 years
	$38.05-$41.95	199,452	$41.82	8.19	50,907	$41.82	8.19 years
	$41.95-$44.75	217,948	$43.05	9.19	—	—	0 years
Total		774,821	$36.65	7.50	271,116	$31.42	5.98 years

Summary of changes in outstanding restricted common stock units

Changes in outstanding RSUs were as follows:

	Total Outstanding Units			Vested Units
	Units		Weighted Average Grant Date Fair Value per Unit	Units		Weighted Average Grant Date Fair Value per Unit
December 31, 2017	1,149,679		$32.05	558,139		$19.80
Granted (1)	188,675		$42.21	—		—
Vested	—		—	144,290		$31.58
Forfeited	(44,855	)	$38.08	—		—
Distributed (2)	(285,250	)	$25.15	(285,250	)	$25.15
December 31, 2018	1,008,249		$35.64	417,179		$20.22

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⁽¹⁾  Includes dividends reinvested into additional RSUs.

⁽²⁾ 

Includes distributed units which were utilized to satisfy withholding taxes due on the distribution.