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Benefit Plans - Stock Options Outstanding (Details)
12 Months Ended
Dec. 31, 2020
$ / shares
shares
Share-based Payment Arrangement, Option, Exercise Price Range [Line Items]  
Number of options outstanding (in shares) | shares 2,986,347
Weighted Average Remaining Contractual Life in Years 1 year 3 months 18 days
Weighted average exercise price (in USD per share) $ 7
$2-$4  
Share-based Payment Arrangement, Option, Exercise Price Range [Line Items]  
Range of exercise prices, lower range limit (in USD per share) 2
Range of exercise prices, upper range limit (in USD per share) $ 4
Number of options outstanding (in shares) | shares 91,500
Weighted Average Remaining Contractual Life in Years 1 year 7 months 6 days
Weighted average exercise price (in USD per share) $ 3
4-6  
Share-based Payment Arrangement, Option, Exercise Price Range [Line Items]  
Range of exercise prices, lower range limit (in USD per share) 4
Range of exercise prices, upper range limit (in USD per share) $ 6
Number of options outstanding (in shares) | shares 149,248
Weighted Average Remaining Contractual Life in Years 4 years 3 months 18 days
Weighted average exercise price (in USD per share) $ 5
6-8  
Share-based Payment Arrangement, Option, Exercise Price Range [Line Items]  
Range of exercise prices, lower range limit (in USD per share) 6
Range of exercise prices, upper range limit (in USD per share) $ 8
Number of options outstanding (in shares) | shares 2,687,999
Weighted Average Remaining Contractual Life in Years 10 months 24 days
Weighted average exercise price (in USD per share) $ 7
8-10  
Share-based Payment Arrangement, Option, Exercise Price Range [Line Items]  
Range of exercise prices, lower range limit (in USD per share) 8
Range of exercise prices, upper range limit (in USD per share) $ 10
Number of options outstanding (in shares) | shares 32,000
Weighted Average Remaining Contractual Life in Years 7 years 3 months 18 days
Weighted average exercise price (in USD per share) $ 10
10-12  
Share-based Payment Arrangement, Option, Exercise Price Range [Line Items]  
Range of exercise prices, lower range limit (in USD per share) 10
Range of exercise prices, upper range limit (in USD per share) $ 12
Number of options outstanding (in shares) | shares 25,600
Weighted Average Remaining Contractual Life in Years 7 years 8 months 12 days
Weighted average exercise price (in USD per share) $ 10