Share-Based Compensation (Tables)

6 Months Ended

Jun. 30, 2018

Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]

Summary of Share-Based Compensation Expense

The following table summarizes share-based compensation expense:

	Three Months Ended						Six Months Ended
	June 30,						June 30,
(in thousands)	2018			2017			2018			2017
Performance unit incentive plan (“PUP”)	$	1,324		$	1,927		$	1,518		$	3,243
Restricted stock		667			774			1,170			1,397
Restricted stock units		54			47			74			107
Share-based compensation before income tax benefit		2,045			2,748			2,762			4,747
Income tax benefit		(515	)		(1,028	)		(696	)		(1,772	)
Share-based compensation, net of income tax benefit	$	1,530		$	1,720		$	2,066		$	2,975

Summary of Activity of the Outstanding Share-Based Compensation Awards

The following table summarizes the activity of the outstanding share-based compensation awards:

	PUP Awards					Restricted Stock					Restricted Stock Units
	Shares			Weighted-Average Grant Date Fair Value		Shares			Weighted-Average Grant Date Fair Value		Shares			Weighted-Average Grant Date Fair Value
Balance at December 31, 2017		239,338		$	32.80		206,899		$	33.16		12,750		$	30.94
Granted		76,925		$	52.03		47,157		$	51.93		3,669		$	52.28
Vested		(75,761	)	$	27.29		(62,684	)	$	27.28		(4,300	)	$	27.35
Forfeited		—		$	—		(2,306	)	$	39.84		(258	)	$	37.69
Balance at June 30, 2018		240,502		$	40.68		189,066		$	39.71		11,861		$	38.70

Summary of Stock Option Activity

Stock Options

The following table summarizes stock option activity:

	Shares			Weighted-Average Exercise Price
Options outstanding and exercisable at December 31, 2017		63,773		$	16.62
Exercised		(5,084	)	$	16.62
Options outstanding and exercisable at June 30, 2018		58,689		$	16.62