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Stock-Based Compensation - Narrative (Details) - USD ($) $ in Millions | 3 Months Ended
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Mar. 31, 2019 | Mar. 31, 2018
Stock-Based Compensation |  |
Stock-based compensation expense (in dollars) | $ 3.1 | $ 2.4
Director |  |
Stock-Based Compensation |  |
Number of share options granted during the period (in shares) | 50,673 | 22,936
Stock Options |  |
Stock-Based Compensation |  |
Number of share options granted during the period (in shares) | 210,243 | 160,462
Restricted Stock Units (RSUs) |  |
Stock-Based Compensation |  |
Number of shares of other than options granted during the period (in shares) | 176,371 | 31,220
Performance Shares |  |
Stock-Based Compensation |  |
Number of shares of other than options granted during the period (in shares) | 228,037 | 76,531
Options Granted in 2019 | Stock Options |  |
Stock-Based Compensation |  |
Vesting period (in years) | 3 years |
Expiration period (in years) | 10 years |
Options Granted in 2018 | 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 2019 | Performance Shares |  |
Stock-Based Compensation |  |
Percentage of shares paid based on total shareholder return relative to 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 |
Performance Shares 2018 | Performance Shares |  |
Stock-Based Compensation |  |
Percentage of shares paid based on total shareholder return relative to 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 Share-based compensation arrangement by share-based payment award, percentage shares granted based on shareholder return relative to peer group of companies. + References No definition available. + Details
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- Definition Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees. + 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=109197908&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=109197908&loc=d3e5070-113901 + Details
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- Definition Period which an employee's right to exercise an award is no longer contingent on satisfaction of either a service condition, market condition or a performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the 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 (a)(1) -URI http://asc.fasb.org/extlink&oid=109197908&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=109197908&loc=d3e5070-113901 + Details
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- Definition The maximum number of shares (or other type of equity) originally approved (usually by shareholders and board of directors), net of any subsequent amendments and adjustments, for awards under the equity-based compensation plan. As stock or unit options and equity instruments other than options are awarded to participants, the shares or units remain authorized and become reserved for issuance under outstanding awards (not necessarily vested). + 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)(3) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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