Stock-Based Compensation (Tables)

3 Months Ended

Mar. 31, 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		312,555			290,880
Forfeited		(70,719	)		(90,801	)
Shares delivered		(69,372	)		—
Balance at March 31,		1,101,850			879,117

Compensation Expense for Stock Option Activity

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

	March 31
In thousands	2018		2017
Three months ended	$	1,804	$	1,039

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 three months ended March 31;

	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		(138,423	)		12.98		(33,050	)		14.65
Canceled / forfeited		(20,994	)		18.76		(17,420	)		18.38
Outstanding at March 31,		2,402,429		$	18.14		2,686,146		$	17.67

Compensation Expense for Stock Option Activity

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

	March 31
In thousands	2018		2017
Three months ended	$	179	$	609