Stock Compensation Plans (Tables)

6 Months Ended

Jun. 30, 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 and six months ended June 30, 2021 and 2020:

($ in thousands)	Three Months Ended June 30,				Six Months Ended June 30,
	2021		2020		2021		2020
Stock compensation costs	$	8,208	$	7,071	$	16,025	$	14,280
Related net tax benefits (deficiencies) for stock compensation plans	$	37	$	(9)	$	1,657	$	(1,575)

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 six months ended June 30, 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	382,359	71.41		91,960	77.67
Vested	(285,513)	67.26		(120,286)	70.13
Forfeited	(65,648)	56.26		—	—
Outstanding, June 30, 2021	1,376,833	$	52.28	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 six months ended June 30, 2021:

	Shares
Outstanding, January 1, 2021	21,802
Granted	15,803
Vested	—
Forfeited	(8,432)
Outstanding, June 30, 2021	29,173