STOCK COMPENSATION PLANS (Tables)

12 Months Ended

Dec. 31, 2015

Disclosure of Compensation Related Costs, Share-based Payments [Abstract]

Schedule of stock compensation expense and related net tax benefit

The following table summarizes the total share-based compensation expense and the related net tax benefit associated with its various employee share-based compensation plans for the years ended December 31, 2015, 2014 and 2013:

($ in thousands)	Year Ended December 31,
	2015		2014		2013
Compensation expense related to RSAs and RSUs	$	16,502	$	13,883	$	13,531
Net tax benefit recognized in equity for stock compensation plans	$	3,291	$	6,513	$	5,522

Schedule of stock option grants, intrinsic value of options exercised, and total fair value of shares vested

The following table presents information related to stock options for the years ended December 31, 2015, 2014 and 2013:

($ in thousands)	Year Ended December 31,
	2015		2014		2013
Cash proceeds from options exercised	$	874	$	4,937	$	1,680
Net tax benefit recognized from options exercised	$	320	$	1,398	$	48
Total intrinsic value of options exercised	$	760	$	3,546	$	926
Total fair value of options vested	N/A		N/A		$	363

Schedule of share-based compensation, time-based and performance-based restricted stock awards activity

The following table presents a summary of the activity for the Company’s time-based RSAs and RSUs, and performance-based RSUs during the year ended December 31, 2015 based on the target amount of awards:

	2015
	RSAs and RSUs
	Time-Based				Performance-Based
	Shares		Weighted Average Grant-Date Fair Value		Shares		Weighted Average Grant-Date Fair Value
Outstanding at beginning of year	751,020		$	30.61	400,508		$	27.51
Granted	477,417		40.36		133,295		41.15
Vested	(225,566	)	23.65		(144,445	)	22.05
Forfeited	(69,559	)	36.64		—		—
Outstanding at end of year	933,312		$	36.83	389,358		$	34.21