Share-Based Compensation (Tables)

12 Months Ended

Dec. 31, 2017

Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]

Summary of Share-Based Compensation Expense

The following table summarizes share-based compensation expense:

	Year Ended December 31,
(in thousands)	2017			2016			2015
Performance unit incentive plan (“PUP”)	$	8,088		$	5,703		$	1,692
Restricted stock		2,594			2,073			2,111
Restricted stock units		287			262			45
Share-based compensation before income tax benefit		10,969			8,038			3,848
Income tax benefit		(4,079	)		(2,988	)		(1,454	)
Share-based compensation, net of income tax benefit	$	6,890		$	5,050		$	2,394

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, 2016		255,505		$	26.11		267,051		$	25.96		15,982		$	25.58
Granted		73,557		$	47.44		67,029		$	46.99		2,950		$	47.45
Vested		(76,082	)	$	24.07		(112,548	)	$	24.04		(6,182	)	$	24.97
Forfeited		(13,642	)	$	34.99		(14,633	)	$	35.31		—		$	—
Balance at December 31, 2017		239,338		$	32.80		206,899		$	33.16		12,750		$	30.94

Summary of Additional Stock Option Information

The following table provides additional stock option information:

	December 31,
(in thousands)	2017		2016		2015
Total intrinsic value of stock options outstanding(1)	$	2,473	$	1,753	$	740
Total intrinsic value of stock options exercised	$	—	$	—	$	1,474
Cash received from the exercise of stock options	$	—	$	—	$	898
Tax benefits realized for tax deductions related to stock option exercises	$	—	$	—	$	104

⁽¹⁾ The intrinsic value of stock options outstanding represents the difference between our closing stock price on December 31 of each year and the exercise price, multiplied by the number of in-the-money stock options.