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Stockholders' Equity - Additional Information (Details)
$ / shares in Units, $ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2018
USD ($)
shares
Jun. 30, 2018
USD ($)
$ / shares
shares
Restricted Stock Awards    
Class of Stock [Line Items]    
Restricted stock and restricted stock units granted (in shares) | shares 13,000 242,000
Grants in the period, aggregate fair value $ 0.2 $ 4.2
Unrecognized compensation costs related to restricted stock awards $ 7.6 $ 7.6
Weighted average period of recognition   2 years 9 months 7 days
Stock Option Awards    
Class of Stock [Line Items]    
Weighted average period of recognition   2 years 8 months 26 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 $ 4.1 $ 4.1
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 $ 1.1 $ 1.1
Weighted average period of recognition   2 years 4 months 2 days