Stock Compensation Plans (Tables)

9 Months Ended

Sep. 30, 2019

Share-based Payment Arrangement [Abstract]

Summary of stock compensation expense and related net tax benefit

The following table presents a summary of the total compensation costs and the related net tax benefits associated with the Company’s various share-based compensation plans for the three and nine months ended September 30, 2019 and 2018:

($ in thousands)	Three Months Ended September 30,				Nine Months Ended September 30,
	2019		2018		2019		2018
Stock compensation costs	$	7,487	$	10,986	$	23,012	$	24,201
Related net tax benefits for stock compensation plans	$	15	$	187	$	4,723	$	5,062

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

The following table presents a summary of the activities and share price information for the Company’s time-based and performance-based RSUs that will be settled in shares for the nine months ended September 30, 2019. The number of outstanding performance-based RSUs stated below assumes the associated performance targets will be met at the target level:

	Time-Based RSUs				Performance-Based RSUs
	Shares		Weighted-Average Grant Date Fair Value		Shares		Weighted-Average Grant Date Fair Value
Outstanding, January 1, 2019	1,121,391		$	51.22	411,290		$	49.93
Granted	495,191		52.53		134,600		54.64
Vested	(359,242	)	31.62		(159,407	)	29.18
Forfeited	(68,511	)	57.20		—		—
Outstanding, September 30, 2019	1,188,829		$	57.34	386,483		$	60.13

The following table presents a summary of the activities for the Company’s time-based RSUs that will be settled in cash for the nine months ended September 30, 2019:

	Shares
Outstanding, January 1, 2019	—
Granted	12,145
Vested	—
Forfeited	(360	)
Outstanding, September 30, 2019	11,785