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Operating expenses, Outstanding Restricted Common Stock (Details) - shares
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Restricted common stock [Abstract]      
Outstanding beginning of period (in shares) 960,865 819,998 560,000
Granted (in shares) 872,953 874,000 810,000
Exercised (in shares) [1] 800,723 733,133 550,002
Forfeited (in shares) 149,400 0 0
Outstanding end of period (in shares) 883,695 960,865 819,998
[1]     Does not include shares in lieu of dividends