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Stock-Based Compensation - Performance Restricted Stock Units (Details) - Performance Restricted Stock Units (PRSUs) | 12 Months Ended
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Dec. 31, 2020 USD ($) award_vesting_period shares | Dec. 31, 2019 USD ($) shares | Dec. 31, 2018 USD ($) shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Number of award achievement periods | award_vesting_period | 3 |  |
Award achievement period | 1 year |  |
Weighted volatility rate | 50.00% |  |
Fair value of performance units granted | $ 3,000,000.0 | $ 3,700,000 | $ 2,000,000.0
Granted (in shares) | shares | 676,615 | 446,858 | 275,550
Award vesting period | 3 years | 3 years | 3 years
Stock-based compensation expense | $ 2,600,000 | $ 2,000,000.0 | $ 1,200,000
Fair value of awards vested | 1,500,000 | $ 0 | $ 0
Unamortized stock compensation expense | $ 3,400,000 |  |
Compensation cost not yet recognized, period for recognition | 1 year 9 months |  |
25th Percentile (Threshold Level) |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Award achievement period | 1 year | 1 year | 1 year
Award vesting percentage | 50.00% |  |
50th Percentile (Target Level) |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Award achievement period | 1 year | 1 year | 1 year
Award vesting percentage | 100.00% |  |
75th Percentile |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Award achievement period | 1 year | 1 year | 1 year
Award vesting percentage | 150.00% |  |
90th Percentile |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Award vesting percentage | 200.00% |  |

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- Definition Amount of expense for award under share-based payment arrangement. Excludes amount capitalized. + References Reference 1: 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 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 2 -Subparagraph (h)(1)(i) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition Weighted-average period over which cost not yet recognized is expected to be recognized for award under share-based payment arrangement, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. + 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 (i) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition Period over which grantee's right to exercise award under share-based payment arrangement is no longer contingent on satisfaction of service or performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. Includes, but is not limited to, combination of market, performance or service condition. + 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 (a)(1) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan). + 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 (c)(2)(iii)(1) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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