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Stock-Based Compensation | 9 Months Ended
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Sep. 30, 2021
Share-based Payment Arrangement [Abstract] |
Stock-Based Compensation | 19. Stock-Based Compensation ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Three Months Ended | ​ | Nine Months Ended
​ | ​ | September 30, | ​ | September 30,
(in thousands) |  | 2021 |  | 2020 |  | 2021 |  | 2020
Equity award expense | ​ | $ | 2,900 | ​ | $ | 2,645 | ​ | $ | 8,741 | ​ | $ | 8,423
Liability award expense | ​ |  | 127 | ​ |  | 243 | ​ |  | 1,121 | ​ |  | 537
Total stock-based compensation expense | ​ | $ | 3,027 | ​ | $ | 2,888 | ​ | $ | 9,862 | ​ | $ | 8,960
​ The following table presents the activity of our stock-settled restricted stock awards, restricted stock units and performance-based restricted stock units and our cash-settled performance-based restricted stock units during the nine months ended September 30, 2021: ​
​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | Weighted
​ | ​ | ​ | ​ | Average
​ | ​ | ​ | ​ | Grant Date
​ | ​ | ​ | ​ | Fair Value
(shares in thousands) |  | Shares |  | Per Share
Non-vested, December 31, 2020 |  | 2,446 | ​ | $ | 9.69
Granted |  | 1,287 | ​ |  | 11.20
Vested |  | (1,023) | ​ |  | 9.95
Canceled |  | (72) | ​ |  | 9.81
Non-vested, September 30, 2021 (1) |  | 2,638 | ​ |  | 10.32
(1) | Comprised of 523 cash-settled units and 2,115 stock-settled awards and units.
As of September 30, 2021, we expect $16.2 million of unrecognized compensation cost related to our non-vested awards and units to be recognized over the weighted average period of 1.9 years.

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- Definition The entire disclosure for share-based payment arrangement. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -URI http://asc.fasb.org/topic&trid=2228938 + Details
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