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General & Administrative Expenses, Outstanding restricted common stock and share options (Details)
 12 Months Ended
Dec. 31, 2019
shares
$ / shares
Dec. 31, 2018
shares
$ / shares
Dec. 31, 2017
shares
$ / shares
Restricted common stock [Abstract]      
Outstanding beginning of period (in shares) 545,500 1,086,331 1,376,820
Granted (in shares) 770,000 567,000 900,000
Exercised (in shares) [1] 755,500 1,085,331 1,132,988
Forfeited (in shares) 0 22,500 57,501
Outstanding end of period (in shares) 560,000 545,500 1,086,331
Share options      
Outstanding beginning of period (in shares) 0 310,000 310,000
Forfeited (in shares)   310,000  
Outstanding end of period (in shares) 0 0 310,000
Weighted average exercise price      
Outstanding beginning of period (in dollars per share) | $ / shares [2] $ 0 $ 9.64 $ 9.64
Forfeited (in dollars per share) | $ / shares [2]   9.64  
Outstanding end of period (in dollars per share) | $ / shares [2] $ 0 $ 0 $ 9.64
[1] Does not include shares in lieu of dividends
[2] To be adjusted for dividends declared and paid subsequent to the respective grant dates.