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Stock-Based Compensation - Narrative (Details) $ / shares in Units, $ in Millions |  | 3 Months Ended | 9 Months Ended
--- | --- | --- | ---
Feb. 15, 2018 $ / shares | Sep. 30, 2018 USD ($) | Sep. 30, 2017 USD ($) | Sep. 30, 2018 USD ($) director shares | Sep. 30, 2017 USD ($)
Stock-Based Compensation |  |  |  |  |
Stock-based compensation expense |  | $ 2.8 | $ 0.6 | $ 8.8 | $ 11.8
Unrecognized compensation cost and vesting period |  |  |  |  |
Unrecognized compensation costs related to unvested share-based compensation arrangements |  | $ 12.4 |  | $ 12.4 |
Weighted-average period for recognition of unrecognized stock-based compensation expense |  |  |  | 2 years 2 months 30 days |
Restricted Stock Units |  |  |  |  |
Stock-Based Compensation |  |  |  |  |
Awarded (in shares) | shares |  |  |  | 188,942 |
Weighted average granted date fair value (in dollars per share) | $ / shares | $ 54.99 |  |  |  |
Vesting period | 3 years |  |  |  |
Directors | Restricted Stock Units |  |  |  |  |
Stock-Based Compensation |  |  |  |  |
Number of directors | director |  |  |  | 8 |
Employees | Restricted Stock Units |  |  |  |  |
Stock-Based Compensation |  |  |  |  |
Vesting period | 4 years |  |  |  |

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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 Unrecognized cost of unvested share-based compensation awards. + 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=109197908&loc=d3e5070-113901 + Details
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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=109197908&loc=d3e5070-113901 + Details
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