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 |