Stock Compensation Plans (Tables)

3 Months Ended

Mar. 31, 2021

Share-based Payment Arrangement [Abstract]

Summary of stock compensation expense and related net tax benefit

The following table presents a summary of the total share-based compensation expense and the related net tax benefits (deficiencies) associated with the Company’s various employee share-based compensation plans for the three months ended March 31, 2021 and 2020:

($ in thousands)	Three Months Ended March 31,
	2021		2020
Stock compensation costs	$	7,817	$	7,209
Related net tax benefits (deficiencies) for stock compensation plans	$	1,620	$	(1,566)

Summary of activity for time-based and performance-based restricted stock units

The following table presents a summary of the activities for the Company’s time-based and performance-based RSUs that will be settled in shares for the three months ended March 31, 2021. The number of performance-based RSUs stated below reflects the number of awards granted on the grant date.

	Time-Based RSUs			Performance-Based RSUs
	Shares	Weighted-Average Grant Date Fair Value		Shares	Weighted-Average Grant Date Fair Value
Outstanding, January 1, 2021	1,345,635	$	50.22	398,057	$	53.66
Granted	374,875	71.40		91,960	77.67
Vested	(275,503)	67.30		(120,286)	70.13
Forfeited	(26,369)	60.94		—	—
Outstanding, March 31, 2021	1,418,638	$	52.30	369,731	$	54.28

Summary of time-based RUS's that will be settled in cash

The following table presents a summary of the activities for the Company’s time-based RSUs that will be vested in cash for the three months ended March 31, 2021:

	Shares
Outstanding, January 1, 2021	21,802
Granted	15,803
Vested	—
Forfeited	(4,075)
Outstanding, March 31, 2021	33,530