Stock-Based Compensation (Tables)

12 Months Ended

Dec. 31, 2022

Share-Based Payment Arrangement, Noncash Expense [Abstract]

Stock-Based Compensation Expense and Related Tax Benefit

Total stock-based compensation expense and the related tax benefit were as follows:

	Year Ended December 31,
In thousands	2022		2021		2020
Stock options	$	891	$	1,371	$	1,944
Restricted stock units	20,038		21,391		22,285
Unrestricted stock awards	952		856		824
Phantom stock units	1,315		3,242		3,720
Total stock-based compensation	$	23,196	$	26,860	$	28,773
Related tax benefit	$	5,371	$	4,991	$	5,086

Employee Stock Options Activity

A summary of our stock option activity is as follows:

	Shares	Weighted Average Exercise Price per Share		Weighted Average Remaining Contractual Life	Aggregate Intrinsic Value		Weighted Average Grant Date Fair Value
	In thousands			Years	In thousands
Outstanding, January 1, 2020	458	$	56.38	7.0	$	12,641
Granted	83	84.39					$	26.37
Exercised	(103)	53.99			2,061
Forfeited	(5)	83.94
Outstanding, December 31, 2020	433	$	61.95	6.9	$	14,697
Granted	—	—					$	—
Exercised	(34)	67.21			1,215
Forfeited	(6)	83.33
Outstanding, December 31, 2021	393	$	61.18	5.9	$	4,737
Granted	—	—					$	—
Exercised	(1)	45.90			4
Canceled	(9)	80.00
Forfeited	(2)	87.27
Outstanding, December 31, 2022	381	$	60.63	4.8	$	1,892
Exercisable, December 31, 2022	360	$	59.25	4.7	$	1,892

Stock Options, Valuation Assumptions

The weighted average assumptions used to estimate the fair value of stock options granted and the resulting weighted average fair value are as follows:

	Year Ended December 31,
	2022		2021		2020
Expected volatility	—	%	—	%	32.3	%
Risk-free interest rate	—	%	—	%	1.3	%
Expected term (years)	N/A		N/A		5.3

Restricted Stock Units Award Activity

The following table summarizes restricted stock unit activity:

	Number of Restricted Stock Units	Weighted Average Grant Date Fair Value		Aggregate Intrinsic Value
	In thousands			In thousands
Outstanding, January 1, 2020	684	$	64.38
Granted	262	83.42
Released (1)	(363)			$	23,702
Forfeited	(39)
Outstanding, December 31, 2020	544	$	71.79
Granted	230	97.66
Released (1)	(293)			$	20,639
Forfeited	(51)
Outstanding, December 31, 2021	430	$	85.77
Granted	391	53.33
Released (1)	(227)	80.08		$	18,169
Forfeited	(66)	71.08
Outstanding, December 31, 2022	528	$	66.39
Vested but not released, December 31, 2022	12	$	50.65	$	606

Restricted Stock Units, Valuation Assumptions

The weighted average assumptions used to estimate the fair value of performance-based restricted stock units granted with a service and market condition and the resulting weighted average fair value are as follows:

	Year Ended December 31,
	2022			2021			2020
Expected volatility	55.7		%	54.2		%	44.9		%
Risk-free interest rate	1.7		%	0.4		%	1.0		%
Expected term (years)	2.9			1.9			1.8
Weighted average fair value	$	57.88		$	77.65		$	93.97

Schedule of Other Share-based Compensation, Activity

The following table summarizes phantom stock unit activity:

	Number of Phantom Stock Units	Weighted Average Grant Date Fair Value		Aggregate Intrinsic Value
	In thousands			In thousands
Outstanding, January 1, 2020	89	$	62.85
Granted	38	87.27
Released	(40)			$	2,971
Forfeited	(5)
Outstanding, December 31, 2020	82	$	73.13
Granted	35	96.49
Released	(41)			$	4,100
Forfeited	(7)
Outstanding, December 31, 2021	69	$	85.47
Granted	59	53.07
Released	(34)	79.08		$	1,780
Forfeited	(9)	76.02
Outstanding, December 31, 2022	85	$	66.46