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Share-Based Compensation - Restricted Stock Units Awards Narrative (Details) - Restricted Stock Units - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Share-based compensation      
Recognized share-based compensation expense $ 4.0 $ 4.2 $ 4.5
Unrecognized compensation cost, net of estimated forfeitures, related to restricted stock unit awards $ 6.7    
Weighted-average period over which unrecognized compensation cost is expected to be recognized 2 years 4 months 24 days