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Stock-Based Compensation - Restricted Stock, Restricted Stock Units, and Performance Units Measurement Inputs (Details) - $ / shares | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Performance-based restricted stock units |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions and Methodology |  |  |
Remaining performance period as of grant date (in years) | 2 years 10 months 24 days | 2 years 10 months 24 days | 2 years 9 months 18 days
Risk-free interest rate (as a percent) | 1.40% | 2.60% | 2.40%
Grant-date fair value (in dollars per share) | $ 11.33 | $ 12.91 | $ 13.46
Restricted stock, restricted stock units, performance-based restricted stock units, cash-settled restricted stock units and cash-settled performance units |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions and Methodology |  |  |
Grant-date fair value (in dollars per share) | $ 9.37 | $ 10.01 | $ 9.66

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- Definition The weighted average fair value at grant date for nonvested equity-based awards issued 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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- Definition The risk-free interest rate assumption that is used in valuing an option on its own shares. + 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 (f)(2)(iv) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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