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Stock-Based Compensation (Shares Outstanding) (Details) - USD ($)
$ / shares in Units, $ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Time-Vested Stock Options [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Outstanding (shares) 211,361 313,317 208,426
Vested or expected to vest (shares) 211,361    
exercisable (shares) 103,458 82,964  
Weighted-Average Remaining Contractual Term, Options Outstanding (in years) 7 years    
Weighted-Average Remaining Contractual Term, Vested or expected to vest (in years) 7 years    
Weighted-Average Remaining Contractual Term, Options exercisable (in years) 6 years 1 month 6 days    
Weighted Average Exercise Price, Options outstanding (per share) $ 11.68 $ 12.70 $ 21.47
Weighted Average Exercise Price, Vested or expected to vest (per share) 11.68    
Weighted-Average Exercise Price, Options exercisable (per share) $ 14.93 $ 23.01  
Stock Appreciation Rights (SARs) [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Outstanding (shares) 853,967    
Vested or expected to vest (shares) 853,937    
Weighted-Average Remaining Contractual Term, Options Outstanding (in years) 9 years 1 month 6 days    
Weighted-Average Remaining Contractual Term, Vested or expected to vest (in years) 9 years 1 month 6 days    
Weighted Average Exercise Price, Options outstanding (per share) $ 1.69    
Weighted Average Exercise Price, Vested or expected to vest (per share) $ 1.69    
Aggregate Intrinsic Value, Options outstanding $ 619,728    
Aggregate Intrinsic Value, Vested or expected to vest $ 619,725