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Stock-Based Compensation - Narrative (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2020 | Jun. 30, 2019 | Jun. 30, 2020 | Jun. 30, 2019
Stock-Based Compensation |  |  |  |
Share-based compensation, remaining shares available for issuance (in shares) | 3,983,976 |  | 3,983,976 |
Stock-based compensation expense (in dollars) | $ 2.5 | $ 3.0 | $ 5.9 | $ 6.1
Director |  |  |  |
Stock-Based Compensation |  |  |  |
Number of share options granted during the period (in shares) | 0 | 0 | 77,608 | 50,673
Stock Options |  |  |  |
Stock-Based Compensation |  |  |  |
Number of share options granted during the period (in shares) | 0 | 0 | 250,432 | 210,243
Vesting period (in years) |  |  | 3 years |
Expiration period (in years) |  |  | 10 years |
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) | 28,070 | 2,000 | 305,519 | 178,371
Performance Shares |  |  |  |
Stock-Based Compensation |  |  |  |
Vesting period (in years) |  |  | 3 years |
Number of shares of other than options granted during the period (in shares) | 6,711 | 0 | 328,310 | 228,037
2013 Omnibus Plan |  |  |  |
Stock-Based Compensation |  |  |  |
Share-based compensation, shares authorized (in shares) | 7,477,395 |  | 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) |  |  | 100.00% |
Percentage of shares paid based on adjusted EBITDA (as a percent) |  |  | 100.00% |
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% |
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) |  |  |  | 50.00%
Percentage of shares paid based on adjusted EBITDA (as a percent) |  |  |  | 50.00%
Performance period (in 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=116856206&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=116856206&loc=d3e5070-113901 + Details
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- Definition The difference between the maximum number of shares (or other type of equity) authorized for issuance under the plan (including the effects of amendments and adjustments), and the sum of: 1) the number of shares (or other type of equity) already issued upon exercise of options or other equity-based awards under the plan; and 2) shares (or other type of equity) reserved for issuance on granting of outstanding awards, net of cancellations and forfeitures, if applicable. + 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 -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
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