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Stock Plans - Unrecognized Share-based Compensation Costs (Details)
$ in Thousands
12 Months Ended
Dec. 31, 2019
USD ($)
Unrecognized share-based compensation costs  
Unrecognized Share-Based Compensation Costs $ 22,779
Weighted Average Period Expected to be Recognized 2 years 3 months 18 days
Restricted stock units  
Unrecognized share-based compensation costs  
Unrecognized Share-Based Compensation Costs $ 1,884
Weighted Average Period Expected to be Recognized 2 years 4 months 24 days
Restricted stock awards  
Unrecognized share-based compensation costs  
Unrecognized Share-Based Compensation Costs $ 15,431
Weighted Average Period Expected to be Recognized 2 years 6 months
Performance share units  
Unrecognized share-based compensation costs  
Unrecognized Share-Based Compensation Costs $ 5,464
Weighted Average Period Expected to be Recognized 1 year 9 months 18 days