Share-Based Compensation (Tables)

12 Months Ended

Dec. 31, 2021

Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]

Schedule of Compensation Expense and Related Income Tax Benefit Recognized for All Share-Based Awards

For the years ended December 31, 2021, December 31, 2020, and December 31, 2019, compensation expense and the related income tax benefit recognized for stock options and restricted stock were as follows:

(dollars in thousands)	2021		2020		2019
Compensation Expense	$	13,267	$	7,578	$	8,338
Income Tax Benefit		3,520		2,009	2,210

Schedule of Activity for Restricted Stock

The following table presents the activity for restricted stock:

	Number of Shares			Weighted Average Grant Date Fair Value		Grant Date Fair Value of Restricted Stock that Vested During the Year (in thousands)
Unvested as of December 31, 2018		314,487		$	78.17
Granted		130,093			82.82
Vested		(107,759	)		66.46	$	8,910
Forfeited		(26,872	)		83.34
Unvested as of December 31, 2019		309,949		$	83.75
Granted		161,168			80.97
Vested		(99,894	)		84.69	$	8,544
Forfeited		(42,454	)		84.36
Unvested as of December 31, 2020		328,769		$	82.02
Granted		292,007			90.23
Vested		(97,278	)		78.55	$	8,673
Forfeited		(22,962	)		86.48
Unvested as of December 31, 2021 1		500,536		$	87.28

¹   As of December 31, 2021, 138,872 shares were unvested from service-based grants.

Schedule of Activity for Restricted Stock Units

The following table presents the activity for RSUs:

	Number of Units			Weighted Average Grant Date Fair Value		Fair Value of Restricted Stock Unit that Vested During the Year (in thousands)
Balance as of December 31, 2018		52,064		$	63.92
Vested		(52,064	)		82.23	$	4,311
Balance as of December 31, 2019		—		$	—

Schedule of Activity Related to Stock Options

The following table presents the activity related to stock options under all plans for the year ended December 31, 2021:

	Stock Options				Weighted Average Exercise Price		Weighted Average Remaining Contractual Term (in years)			Aggregate Intrinsic Value (in thousands)
Stock Options Outstanding as of January 1, 2021		184,054			$	45.28
Exercised		(165,920	)			45.04
Expired		(833	)			42.22
Stock Options Outstanding as of December 31, 2021		17,301		47.72				0.1		$	624
Stock Options Vested and Exercisable as of December 31, 2021		17,301		47.72				0.1	624

Summary of Certain Stock Option Activity

The following summarizes certain stock option activity of the Company for the years ended December 31, 2021, December 31, 2020, and December 31, 2019:

(dollars in thousands)	2021		2020		2019
Intrinsic Value of Stock Options Exercised	$	6,755	$	2,261	$	1,106
Cash Received from Stock Options Exercised		7,473		2,438		1,473
Tax Benefits Realized from Stock Options Exercised		1,611		485		727