Accounting for Stock Based Compensation (Tables)

12 Months Ended

Dec. 31, 2020

Share Based Compensation Arrangement By Share Based Payment Award [Line Items]

Summary of Stock Option Activity

The following table summarizes stock option activity during the years ended December 31, 2020, 2019 and 2018:

Options	Shares			Weighted-Average Exercise Price		Weighted-Average Remaining Contractual Term		Aggregate Intrinsic Value
Outstanding at December 31, 2017		2,652,142		$	35.34		4.76	$	6,964
Granted		—			—
Exercised		(615,358	)		24.01
Forfeited		(383,784	)		39.59
Outstanding at December 31, 2018		1,653,000		$	38.53		4.28	$	3,610
Granted		—			—
Exercised		(428,250	)		38.66
Forfeited		(355,750	)		39.99
Outstanding at December 31, 2019		869,000		$	37.87		3.51	$	5,172
Granted		—			—
Exercised		(434,250	)		38.12
Forfeited		(6,750	)		38.05
Outstanding at December 31, 2020		428,000		$	37.61		3.20	$	11,815
Exercisable at December 31, 2020		338,625		$	37.87		3.11	$	9,261

Restricted Stock Activity

The following table summarizes restricted stock activity during the years ended December 31, 2020, 2019 and 2018:

Unvested Restricted Shares	Shares			Weighted-Average Grant Date Fair Value
Outstanding at December 31, 2017		282,100		$	38.06
Granted		21,681			35.00
Vested		(130,684	)		38.62
Forfeited		(36,531	)		37.60
Outstanding at December 31, 2018		136,566		$	37.16
Granted		19,920			40.16
Vested		(91,566	)		37.09
Forfeited		(30,000	)		38.05
Outstanding at December 31, 2019		34,920		$	38.31
Granted		32,406			39.96
Vested		(32,420	)		38.33
Forfeited		—			—
Outstanding at December 31, 2020		34,906		$	39.82

SARs Activity

The following table summarizes SARs activity during the years ended December 31, 2020, 2019 and 2018:

Stock Appreciation Rights	Shares			Weighted-Average Exercise Price		Weighted-Average Remaining Contractual Term		Aggregate Intrinsic Value
Outstanding at December 31, 2017		1,192,350		$	38.17		4.36	$	2,278
Granted		—			—
Exercised		(204,250	)		26.35
Forfeited		—			—
Outstanding at December 31, 2018		988,100		$	40.61		3.57	$	2,064
Granted		—			—
Exercised		(179,500	)		32.84
Forfeited		(254,350	)		42.63
Outstanding at December 31, 2019		554,250		$	39.41		2.84	$	2,981
Granted		—			—
Exercised		(342,150	)		38.22
Forfeited		(40,500	)		44.39
Outstanding at December 31, 2020		171,600		$	40.60		2.44	$	4,224
Exercisable at December 31, 2020		131,350		$	41.39		2.22		3,131

RSU

Share Based Compensation Arrangement By Share Based Payment Award [Line Items]

Restricted Stock Activity

The following table summarizes restricted stock unit activity during the years ended December 31, 2020, 2019 and 2018:

				Performance-Based Awards
Unvested Restricted Stock Units	Time Vesting Shares			ROIC Target Shares			TSR Target Shares			Total
Outstanding at December 31, 2017		—			—			—			—
Granted		86,392			64,785			64,792			215,969
Vested		—			—			—			—
Forfeited		—			—			—			—
Outstanding at December 31, 2018		86,392			64,785			64,792			215,969
Granted		107,391			56,380			56,375			220,146
Vested		(23,956	)		—			—			(23,956	)
Forfeited		(28,086	)		(26,124	)		(26,128	)		(80,338	)
Outstanding at December 31, 2019		141,741			95,041			95,039			331,821
Granted		132,864			77,967			77,967			288,798
Vested		(50,953	)		—			—			(50,953	)
Forfeited		(14,747	)		(15,090	)		(15,090	)		(44,927	)
Outstanding at December 31, 2020		208,905			157,918			157,916			524,739

The total intrinsic value of restricted stock units vested during the years ended December 31, 2020, 2019 and 2018 was $2,214, $1,000 and $0, respectively.