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Stock-Based Compensation (Tables)

12 Months Ended

Dec. 31, 2021

Stock-Based Compensation

Schedule of allocated stock-based compensation

​

​	​	​	​	​	​	​	​	​	​
​	​	Year Ended December 31,
(in thousands)	​	2021			2020			2019
Equity award expense	​	$	11,336	​	$	10,551	​	$	8,105
Liability award (benefit) expense (1)	​		(816)	​		1,521	​		2,336
Total stock-based compensation expense	​	$	10,520	​	$	12,072	​	$	10,441

(1) In 2021, includes a reversal of prior period expense of $2.1 million during the fourth quarter as the result of revised estimates of performance achievement of our 2019 and 2020 cash-settled performance-based restricted stock units.

Schedule of valuation assumptions

​

​	​	​	​	​	​	​	​	​	​	​
​	​	Year Ended December 31,								​
​	​	2021		​	2020		​	2019		​
Remaining performance period as of grant date (in years)		​	2.8		​	2.9		​	2.9
Risk-free interest rate used		​	0.3	%	​	1.4	%	​	2.6	%
Grant-date fair value	​	$	14.30	​	$	11.33	​	$	12.91	​

Schedule of restricted stock, restricted stock unit, performance unit, cash settled restricted stock unit and cash settled performance unit activity

​

​	​	​	​	​	​
​	​	​	​	Weighted
​	​	​	​	Average
​	​	​	​	Grant Date
​	​	Shares	​	Fair Value
​		(in thousands)		Per Share
Non-vested restricted stock, December 31, 2020		2,446	​	$	9.69
Granted (1)		1,288	​		11.20
Vested (2)		(1,075)	​		9.91
Canceled		(81)	​		9.85
Non-vested restricted stock, December 31, 2021 (3)		2,578	​		10.35

(1) The weighted average grant date fair value of shares granted during the years ended December 31, 2021, 2020 and 2019 was $11.20, $9.37 and $10.01, respectively.

(2) The total fair value of all awards vested during the years ended December 31, 2021, 2020 and 2019 was $9.1 million, $7.1 million and $9.0 million, respectively.

(3) Non-vested awards as of December 31, 2021 were comprised of 523 cash-settled units and 2,055 stock-settled awards and units.

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Tabular disclosure of allocation of amount expensed and capitalized for award under share-based payment arrangement to statement of income or comprehensive income and statement of financial position. Includes, but is not limited to, corresponding line item in financial statement.

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