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Stock-based Compensation - Stock Option Exercise Price (Details)
12 Months Ended
Dec. 31, 2019
$ / shares
shares
$20.00  
Stock options exercisable and vested by exercise price range  
Exercise price (in dollars per share) | $ / shares $ 20.00
Options Outstanding  
Number of Shares 244,153
Weighted-Average Remaining Life 5 months 19 days
Stock options exercisable and vested  
Number of Shares 244,153
Weighted-Average Remaining Life (in years) 5 months 19 days
$28.80  
Stock options exercisable and vested by exercise price range  
Exercise price (in dollars per share) | $ / shares $ 28.80
Options Outstanding  
Number of Shares 120,000
Weighted-Average Remaining Life 1 year 3 months 25 days
Stock options exercisable and vested  
Number of Shares 120,000
Weighted-Average Remaining Life (in years) 1 year 3 months 25 days
$20.00 - $28.80  
Options Outstanding  
Number of Shares 364,153
Weighted-Average Remaining Life 9 months
Stock options exercisable and vested  
Number of Shares 364,153
Weighted-Average Remaining Life (in years) 9 months
Minimum | $20.00 - $28.80  
Stock options exercisable and vested by exercise price range  
Exercise price (in dollars per share) | $ / shares $ 20.00
Maximum | $20.00 - $28.80  
Stock options exercisable and vested by exercise price range  
Exercise price (in dollars per share) | $ / shares $ 28.80