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Stockholders' Equity - Additional Information (Details) $ / shares in Units, $ in Millions	3 Months Ended	9 Months Ended
	Sep. 30, 2018 USD ($) shares	Sep. 30, 2018 USD ($) $ / shares shares
Restricted Stock Awards
Class of Stock [Line Items]
Restricted stock and restricted stock units granted (in shares) | shares	9,000	252,000
Grants in the period, aggregate fair value	$ 0.2	$ 4.4
Unrecognized compensation costs related to restricted stock awards	$ 6.7	$ 6.7
Weighted average period of recognition		2 years 7 months 13 days
Stock Option Awards
Class of Stock [Line Items]
Weighted average period of recognition		2 years 6 months 29 days
Options, granted (in shares) | shares	0	252,000
Weighted average exercise price (in dollars per share) | $ / shares		$ 17.34
Unrecognized compensation costs related to options	$ 3.6	$ 3.6
Performance Restricted Stock Units
Class of Stock [Line Items]
Restricted stock and restricted stock units granted (in shares) | shares	0	49,000
Grants in the period, aggregate fair value		$ 0.8
Unrecognized compensation costs related to restricted stock awards	$ 1.0	$ 1.0
Weighted average period of recognition		2 years 1 month 6 days

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-Publisher FASB
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-Section 50
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