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Summary of Significant Accounting Policies (Antidilutive Securities Excluded from Earnings Per Share) (Details) - $ / shares
3 Months Ended 9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Weighted-average shares of non-vested restricted stock        
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]        
Antidilutive securities excluded from computation (in shares) 612,538 1,012,285 555,918 1,274,549
Weighted-average expense per share (in dollars per share) $ 18.29 $ 18.03 $ 19.54 $ 17.95
Weighted-average number of shares issuable upon conversion of debt        
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]        
Antidilutive securities excluded from computation (in shares) 0 11,447,061 3,237,522 11,447,061
Weighted-average conversion price (in dollars per share) $ 0 $ 20.27 $ 20.27 $ 20.27