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Stock-Based Compensation (Tables)

12 Months Ended

Dec. 31, 2020

Share-based Payment Arrangement [Abstract]

Schedule of allocated stock-based compensation

Stock-based compensation expense consisted of the following (in thousands):

​	​	​	​	​	​	​	​	​	​
​	​	Year Ended December 31,
​	​	2020			2019			2018
Equity awards	​	$	10,551	​	$	8,105	​	$	7,388
Liability awards	​		1,521	​		2,336	​		1,096
Total stock-based compensation expense	​	$	12,072	​	$	10,441	​	$	8,484

​

Summary of stock option activity

​

​	​	​	​	​	​	​	​	​	​	​	​
​	​	​	​	Weighted		​	Weighted		​	Aggregate
​	​	Stock	​	Average		​	Average		​	Intrinsic
​	​	Options	​	Exercise Price		​	Remaining Life		​	Value
​		(in thousands)		per Share			(in years)			(in thousands)
Options outstanding and exercisable, December 31, 2019		154	​	$	19.40	​	​	​	​	​	​
Canceled		(90)	​		15.32	​	​	​	​	​	​
Options outstanding and exercisable, December 31, 2020		64	​	​	25.18	​	​	0.2	​	$	—

Share-Based Compensation Measurement Inputs [Table Text Block]

​

​	​	​	​	​	​	​	​	​	​	​
​	​	Year Ended December 31,								​
​	​	2020		​	2019		​	2018		​
Remaining performance period as of grant date (in years)		​	2.9		​	2.9		​	2.8
Risk-free interest rate used		​	1.4	%	​	2.6	%	​	2.4	%
Grant-date fair value	​	$	11.33	​	$	12.91	​	$	13.46	​

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

​

​	​	​	​	​	​
​	​	​	​	Weighted
​	​	​	​	Average
​	​	​	​	Grant Date
​	​	​	​	Fair Value
​		Shares		Per Share
Non-vested awards, December 31, 2019		2,022	​	$	10.25
Granted (1)		1,467	​		9.37
Vested (2)		(933)	​		10.39
Canceled		(110)	​		9.78
Non-vested awards, December 31, 2020 (3)		2,446	​		9.69

(1) The weighted average grant date fair value of shares granted during the years ended December 31, 2020, 2019 and 2018 was $9.37, $10.01 and $9.66, respectively.

(2) The total fair value of all awards vested during the years ended December 31, 2020, 2019 and 2018 was $7.1 million, $9.0 million and $8.2 million, respectively.

(3) Non-vested awards as of December 31, 2020 were comprised of 454,000 cash-settled restricted stock units and cash-settled performance units and 1,992,000 restricted stock, stock-settled restricted stock units and stock-settled performance-based restricted stock units.

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Tabular disclosure of valuation assumptions for share-based payment.

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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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Tabular disclosure for stock option plans. Includes, but is not limited to, outstanding awards at beginning and end of year, grants, exercises, forfeitures, and weighted-average grant date fair value.

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