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Stock-Based Compensation (Tables) | 12 Months Ended
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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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- Definition Tabular disclosure of valuation assumptions for share-based payment. + References No definition available. + Details
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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 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. + 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 (d) -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 50 -Paragraph 2 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + 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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