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Stock-Based Compensation - Allocated Compensation (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
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Jun. 30, 2019 | Jun. 30, 2018 | Jun. 30, 2019 | Jun. 30, 2018
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost |  |  |  |
Total stock-based compensation | $ 2,152 | $ 2,635 | $ 5,475 | $ 4,730
Equity awards |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost |  |  |  |
Total stock-based compensation | 1,512 | 1,969 | 3,869 | 3,763
Liability awards |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost |  |  |  |
Total stock-based compensation | $ 640 | $ 666 | $ 1,606 | $ 967

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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=116856206&loc=d3e5070-113901 + Details
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