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Stock-Based Compensation - Allocated Compensation (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Stock-Based Compensation      
Total stock-based compensation expense $ 10,441 $ 8,484 $ 10,040
Equity awards      
Stock-Based Compensation      
Total stock-based compensation expense 8,105 7,388 8,460
Liability awards      
Stock-Based Compensation      
Total stock-based compensation expense $ 2,336 $ 1,096 $ 1,580