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Stock-Based Compensation (Tables) | 9 Months Ended
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Sep. 30, 2020
Share-based Payment Arrangement [Abstract] |
Schedule of allocated stock-based compensation | Stock-based compensation expense consisted of the following (in thousands):
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Three Months Ended | ​ | Nine Months Ended | ​
​ | ​ | September 30, | ​ | September 30, | ​
​ |  | 2020 |  | 2019 |  | 2020 |  | 2019 | ​
Equity awards | ​ | $ | 2,645 | ​ | $ | 2,276 | ​ | $ | 8,423 | ​ | $ | 6,145 | ​
Liability awards | ​ |  | 243 | ​ |  | 274 | ​ |  | 537 | ​ |  | 1,880 | ​
Total stock-based compensation expense | ​ | $ | 2,888 | ​ | $ | 2,550 | ​ | $ | 8,960 | ​ | $ | 8,025 | ​
Schedule of restricted stock, restricted stock unit, performance unit, cash settled restricted stock unit and cash settled performance unit activity | The following table presents restricted stock, restricted stock unit, performance-based restricted stock unit and cash-settled performance unit activity during the nine months ended September 30, 2020 (shares in thousands):
​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | Weighted
​ | ​ | ​ | ​ | Average
​ | ​ | ​ | ​ | Grant Date
​ | ​ | ​ | ​ | Fair Value
​ |  | Shares |  | Per Share
Non-vested awards, December 31, 2019 |  | 2,022 | ​ | $ | 10.25
Granted |  | 1,454 | ​ |  | 9.40
Vested |  | (901) | ​ |  | 10.43
Canceled |  | (61) | ​ |  | 10.19
Non-vested awards, September 30, 2020 (1) |  | 2,514 | ​ |  | 9.69
(1) | Non-vested awards as of September 30, 2020 are comprised of 454,000 cash-settled restricted stock units and cash-settled performance units and 2,060,000 restricted stock and stock-settled performance units.

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- Definition 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. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(1) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB Topic 14.F) -URI http://asc.fasb.org/extlink&oid=115993241&loc=d3e301413-122809 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5047-113901 + Details
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- Definition Disclosure of the number and weighted-average grant date fair value for restricted stock and restricted stock units that were outstanding at the beginning and end of the year, and the number of restricted stock and restricted stock units that were granted, vested, or forfeited during the year. + References No definition available. + Details
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