Stockholders' Equity (Tables)

12 Months Ended

Dec. 31, 2022

Equity [Abstract]

Schedule of Compensation Cost for Share-based Payment Arrangements, Allocation of Share-based Compensation Costs by Plan

The following table summarizes our compensation costs recognized in General and administrative expense (excluding depreciation) and Operating expense (excluding depreciation) under the Incentive Plan and Stock Purchase Plan (in thousands):

	Years Ended December 31,
	2022		2021		2020
Restricted Stock Awards	$	5,172	$	4,657	$	3,939
Restricted Stock Units	$	1,451	$	1,356	$	1,510
Stock Option Awards	$	2,540	$	1,939	$	1,660

Share-based Payment Arrangement, Restricted Stock and Restricted Stock Unit, Activity

The following tables summarize our restricted stock activity (in thousands, except per share amounts):

	Shares	Weighted- Average Grant Date Fair Value
Unvested balance at December 31, 2021	760	$	17.19
Granted	464	15.27
Vested	(336)	17.01
Forfeited	(94)	16.49
Unvested balance at December 31, 2022	794	$	16.24

	Years Ended December 31,
	2022		2021		2020
Weighted-average grant-date fair value per share of restricted stock awards and restricted stock units granted (in dollars)	$	15.27	$	16.38	$	16.97
Fair value of restricted stock awards and restricted stock units vested	$	5,718	$	4,370	$	3,787

The following tables summarize our performance restricted stock activity (in thousands, except per unit amounts):

	Units	Weighted- Average Grant Date Fair Value
Unvested balance at December 31, 2021	158	$	17.61
Granted	50	14.91
Vested	(70)	17.31
Forfeited	(25)	16.81
Unvested balance at December 31, 2022	113	$	16.78

	Years Ended December 31,
	2022		2021		2020
Weighted-average grant-date fair value per share of performance restricted stock units granted (in dollars)	$	14.91	$	16.52	$	19.73
Fair value of performance restricted stock units vested	$	1,343	$	940	$	783

Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value

The weighted-average assumptions used to measure stock options granted during 2022, 2021, and 2020 are presented below.

	2022	2021	2020
Expected life from date of grant (in years)	5.3	5.3	5.3
Expected volatility	55.4%	53.2%	33.2%
Risk-free interest rate	1.83%	0.64%	1.31%

Schedule of Share-based Compensation, Stock Options, Activity

The following table summarizes our stock option activity (in thousands, except per share amounts and term years):

	Number of Options	Weighted-Average Exercise Price		Weighted-Average Remaining Contractual Term in Years	Aggregate Intrinsic Value
Outstanding balance at December 31, 2021	2,195	$	18.50	4.2	$	446
Issued	449	14.91
Exercised	(349)	16.79
Forfeited / canceled / expired	(275)	19.13
Outstanding balance at December 31, 2022	2,020	$	17.92	4.3	$	10,779
Exercisable, end of year	1,300	$	18.94	3.2	$	5,608