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Stock-Based Compensation - Compensation Expense (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost |  |  |
Total stock-based compensation expense | $ 12,072 | $ 10,441 | $ 8,484
Equity awards |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost |  |  |
Total stock-based compensation expense | 10,551 | 8,105 | 7,388
Liability awards |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost |  |  |
Total stock-based compensation expense | $ 1,521 | $ 2,336 | $ 1,096

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- Definition Amount of cost expensed and capitalized for award under share-based payment arrangement. + 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 + Details
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