STOCK INCENTIVE PLANS (Tables)

6 Months Ended

Jun. 30, 2018

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

Schedule of Share-based Compensation, Restricted Stock Units Activity

The following table details our issuance of restricted stock units and the aggregate weighted average grant date fair values under these plans for the years indicated.

	Six Months Ended June 30,
(dollars in thousands)	2018		2017
Restricted stock units	937,155		707,851
Weighted average grant date fair values	$	12,370	$	10,398

Summary of Activity Relating to Restricted Stock Units

The following table summarizes the activity relating to restricted stock units during the periods indicated:

	Six Months Ended June 30,
	2018				2017
	Units		Weighted Average Grant Price per Share		Units		Weighted Average Grant Price per Share
Unvested units outstanding at beginning of period	1,975,862		$	13.64	1,836,363		$	12.97
Granted	937,155		13.20		707,851		14.69
Vested	(257,712	)	13.18		(592,202	)	12.84
Forfeited/expired	(180,723	)	13.30		(14,679	)	13.23
Dividend reinvestment	38,129		14.02		28,454		14.49
Unvested units outstanding at end of period	2,512,711		13.56		1,965,787		13.65

Schedule of Certain Information Related to Restricted Stock Units

The following table provides certain information related to restricted stock units:

(in thousands)	Six Months Ended June 30,
	2018		2017
Stock-based compensation expense	$	4,699	$	3,958
Tax benefit related to stock-based compensation expense	987		1,385
Fair value of units vested	3,472		8,013

Components of Restricted Stock Units

The components of the restricted stock units as of June 30, 2018 are as follows:

(dollars in thousands)	Service- Based Units		Performance- Based Units		Total
Unvested restricted stock units	1,449,400		1,063,311		2,512,711
Unrecognized compensation expense	$	12,405	$	6,646	$	19,051
Intrinsic value	$	19,451	$	14,270	$	33,721
Weighted average remaining life (in years)	2.29		2.05		2.19

Summary of Activity Relating to Stock Options

The following table summarizes the activity relating to stock options during the periods indicated:

	Six Months Ended June 30,
	2018				2017
	Shares		Weighted Average Exercise Price per  Share		Shares		Weighted Average Exercise Price per  Share
Options outstanding at beginning of period	722,650		$	7.96	892,532		$	8.95
Assumed from acquisitions	—		—		207,645		8.92
Exercised	(197,390	)	7.93		(155,597	)	9.43
Forfeited/expired	(4,598	)	11.65		(56,510	)	11.17
Options outstanding and exercisable at end of period	520,662		7.96		888,070		8.72