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Stock-Based Compensation - Narrative (Details) - USD ($) $ in Millions | 3 Months Ended
--- | ---
Mar. 31, 2021 | Mar. 31, 2020
Stock-Based Compensation |  |
Share-based compensation, remaining shares available for issuance (in shares) | 4,179,857 |
Stock-based compensation expense (in dollars) | $ 2.5 | $ 3.4
Director |  |
Stock-Based Compensation |  |
Number of share options granted during the period (in shares) | 56,672 | 77,608
Stock Options |  |
Stock-Based Compensation |  |
Number of share options granted during the period (in shares) | 0 | 250,432
Restricted Stock Units |  |
Stock-Based Compensation |  |
Vesting period (in years) | 3 years |
Number of shares of other than options granted during the period (in shares) | 316,974 | 277,449
Performance Shares |  |
Stock-Based Compensation |  |
Vesting period (in years) | 3 years |
Number of shares of other than options granted during the period (in shares) | 203,697 | 321,599
Options Granted in 2020 | Stock Options |  |
Stock-Based Compensation |  |
Vesting period (in years) | 3 years |
Expiration period (in years) | 10 years |
Options Granted in 2019 | Stock Options |  |
Stock-Based Compensation |  |
Vesting period (in years) |  | 3 years
Expiration period (in years) |  | 10 years
2013 Omnibus Plan |  |
Stock-Based Compensation |  |
Share-based compensation, shares authorized (in shares) | 7,477,395 |
Performance Shares 2020 | Performance Shares |  |
Stock-Based Compensation |  |
Percentage of shares paid based on total shareholder return relative to defined peer group (as a percent) | 60.00% |
Percentage of shares paid based on adjusted EBITDA (as a percent) | 40.00% |
Performance period (in years) | 3 years |
Increase decrease in percentage of shares paid based on total shareholder return relative to defined peer group | 20.00% | 20.00%
Performance Shares 2019 | Performance Shares |  |
Stock-Based Compensation |  |
Percentage of shares paid based on total shareholder return relative to defined peer group (as a percent) | 200.00% | 200.00%
Percentage of shares paid based on adjusted EBITDA (as a percent) |  | 100.00%
Performance period (in years) | 3 years | 3 years

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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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