Equity Compensation Plans and Share-Based Compensation (Tables)

12 Months Ended

Dec. 31, 2020

Share-based Payment Arrangement [Abstract]

Schedule of Nonvested Stock Options Activity

The following table summarizes the restricted stock unit award activity for the years ended December 31, 2020, 2019 and 2018 (shares in thousands):

	2020			2019			2018
		Weighted-			Weighted-			Weighted-
		Average			Average			Average
	Underlying	Fair Value		Underlying	Fair Value		Underlying	Fair Value
	Shares	of Grant		Shares	of Grant		Shares	of Grant
Outstanding at beginning of year	357	$	69.13	254	$	59.53	157	$	47.36
Performance-based grants (1)	238	78.40		109	86.86		102	72.70
Time-based grants	21	84.93		19	86.86		17	72.70
Performance-based vested	(117)	48.25		(10)	45.93		(10)	45.93
Time-based vested	(12)	76.84		(15)	73.78		(12)	43.55
Performance-based canceled (2)	(114)	84.93		—	—		—	—
Outstanding at end of year	373	$	77.40	357	$	69.13	254	$	59.53

(1)Represents the maximum possible award. The Company’s level of achievement of the respective performance goals will result in actual vesting of between zero shares and the maximum share award. Performance-based grants for 2020 include 114 shares which were subsequently cancelled in 2020 as described in footnote (2) below.

(2)Represents cancellation of performance-based awards granted in January of 2020 that were subsequently replaced with a new performance-based award granted in December 2020. The grant date fair value of the December 2020 replacement performance-based awards was $72.37 per share.

Schedule of Stock Options Activity

The following table summarizes stock option activity for the years ended December 31, 2020, 2019 and 2018 (shares in thousands):

	2020			2019			2018
		Weighted-			Weighted-			Weighted-
		Average			Average			Average
	Underlying	Exercise		Underlying	Exercise		Underlying	Exercise
	Shares	Price		Shares	Price		Shares	Price
Outstanding at beginning of year	70	$	38.86	80	$	39.00	90	$	39.11
Exercised	(60)	39.00		(10)	40.00		(10)	40.00
Outstanding at end of year	10	38.00		70	38.86		80	39.00
Exercisable at end of year	—	—		40	39.00		30	39.33

Schedule of Employee Service Share-based Compensation, Allocation of Recognized Period Costs

The Company’s net income includes the following compensation costs related to share-based compensation arrangements (in thousands):

	Year Ended December 31,
	2020		2019		2018
Gross compensation costs:
Restricted stock unit awards	$	2,899	$	8,637	$	5,712
Stock options	15		43		74
Total gross compensation costs	2,914		8,680		5,786
Income tax benefits:
Restricted stock unit awards	(901)		(302)		(1,320)
Exercise of stock options	(94)		(114)		(94)
Total income tax benefits	(995)		(416)		(1,414)
Net compensation expense	$	1,919	$	8,264	$	4,372