Quarterly report pursuant to Section 13 or 15(d)

Stock-Based Compensation (Schedule of Changes in Number of Outstanding Stock Options Under Director Plan, Stock Plan and 2011 Incentive Plan) (Details)

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Stock-Based Compensation (Schedule of Changes in Number of Outstanding Stock Options Under Director Plan, Stock Plan and 2011 Incentive Plan) (Details) - 2011 Executive Incentive Compensation Plan [Member] - $ / shares
9 Months Ended 12 Months Ended
Sep. 30, 2021
Dec. 31, 2020
Share-based Payment Arrangement, Option, Activity [Line Items]    
Options, Outstanding – December 31, 2020 1,173,190  
Options, Awarded  
Options, Exercised (799,390)  
Options, Forfeited (373,800)  
Options, Outstanding – September 30, 2021 0 1,173,190
Options, Exercisable at September 30, 2021  
Options, Expected to vest September 30, 2021  
Weighted average exercise price per share, Outstanding – December 31, 2020 $ 6.52  
Weighted average exercise price per share, Awarded  
Weighted average exercise price per share, Exercised 4.70  
Weighted average exercise price per share, Forfeited 10.43  
Weighted average exercise price per share, Outstanding – September 30, 2021 $ 6.52
Weighted average exercise price per share, Exercisable at September 30, 2021  
Weighted average exercise price per share, Expected to vest September 30, 2021  
Weighted average remaining contractual term in years, Outstanding   3 years 4 months 6 days