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Stockholders' Equity - Additional Information (Details) $ / shares in Units, shares in Thousands, $ in Millions	3 Months Ended
	Mar. 31, 2018 USD ($) $ / shares shares
Restricted Stock Awards
Class of Stock [Line Items]
Restricted stock and restricted stock units granted (in shares) | shares	229
Grants in the period, aggregate fair value	$ 4.0
Unrecognized compensation costs related to restricted stock awards	$ 8.7
Weighted average period of recognition	2 years 11 months 15 days
Stock Option Awards
Class of Stock [Line Items]
Weighted average period of recognition	2 years 10 months 27 days
Options, granted (in shares) | shares	252
Weighted average exercise price (in dollars per share) | $ / shares	$ 17.34
Unrecognized compensation costs related to options	$ 4.7
Performance Restricted Stock Units
Class of Stock [Line Items]
Restricted stock and restricted stock units granted (in shares) | shares	49
Grants in the period, aggregate fair value	$ 0.8
Unrecognized compensation costs related to restricted stock awards	$ 1.3
Weighted average period of recognition	2 years 6 months 25 days

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Weighted average period over which unrecognized compensation is expected to be recognized for equity-based compensation plans, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
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Unrecognized cost of unvested share-based awards, other than options, awarded to employees as compensation.

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Unrecognized cost of unvested options awarded to employees as compensation.

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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).

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