Stock-Based Compensation (Tables)

6 Months Ended

Jun. 30, 2018

Restricted Stock Units (RSU) and Performance Share Awards (PSAs) [Member]

Summary of Share Based Compensation Activity

The following table summarizes RSU and PSA activity during periods indicated:

Units	2018			2017
Balance at January 1,		929,386			679,038
Granted		389,065			364,748
Forfeited		(70,891	)		(91,449	)
Shares delivered		(150,020	)		(24,052	)
Balance at June 30,		1,097,540			928,285

Compensation Expense for Stock Option Activity

The following table sets forth aggregate RSU and PSA compensation expense for the periods indicated:

	June 30
In thousands	2018		2017
Three months ended	$	1,651	$	1,049
Six months ended		3,455		2,088

Stock Only Stock Appreciation Rights (SOSARs) [Member]

Summary of Share Based Compensation Activity

The following table sets forth information related to outstanding SOSARS for the six months ended June 30;

	2018					2017
SOSARS	Shares			Wtd Avg Exercise Price		Shares			Wtd Avg Exercise Price
Outstanding at January 1,		2,561,846		$	17.87		2,736,616		$	17.64
Granted		—			—		—			—
Exercised		(148,145	)		13.26		(33,050	)		14.65
Canceled / forfeited		(20,994	)		18.76		(17,630	)		18.46
Outstanding at June 30,		2,392,707		$	18.15		2,685,936		$	17.67

Compensation Expense for Stock Option Activity

The following table sets forth SOSAR compensation expense for the periods indicated:

	June 30
In thousands	2018		2017
Three months ended	$	70	$	259
Six months ended		249		868