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Stock-Based Compensation | 3 Months Ended
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Mar. 31, 2021
Share-based Payment Arrangement [Abstract] |
Stock-Based Compensation | 19. Stock-Based Compensation ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Three Months Ended
​ | ​ | March 31,
(in thousands) |  | 2021 |  | 2020
Equity awards | ​ | $ | 2,663 | ​ | $ | 3,006
Liability awards | ​ |  | 586 | ​ |  | (548)
Total stock-based compensation expense | ​ | $ | 3,249 | ​ | $ | 2,458
​ 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 three months ended March 31, 2021: ​
​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | Weighted
​ | ​ | ​ | ​ | Average
​ | ​ | ​ | ​ | Grant Date
​ | ​ | ​ | ​ | Fair Value
(shares in thousands) |  | Shares |  | Per Share
Non-vested awards, December 31, 2020 |  | 2,446 | ​ | $ | 9.69
Granted |  | 1,279 | ​ |  | 11.22
Vested |  | (594) | ​ |  | 9.30
Canceled |  | (26) | ​ |  | 9.80
Non-vested awards, March 31, 2021 (1) |  | 3,105 | ​ |  | 10.39
(1) | Non-vested awards as of March 31, 2021 are comprised of 611,000 cash-settled units and 2,494,000 stock-settled awards and units.
As of March 31, 2021, we expect $24.0 million of unrecognized compensation cost related to our non-vested awards and units to be recognized over the weighted average period of 2.2 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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