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Earnings Per Share (Antidilutive Securities Excluded from Earnings Per Share) (Details) - $ / shares
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Restricted Stock      
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]      
Antidilutive securities excluded from computation (in shares) 520,936 1,207,366 0
Weighted-average expense per share (in dollars per share) $ 19.54 $ 17.97 $ 0
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) 2,423,719 11,118,139 30,212,414
Weighted-average conversion price (in dollars per share) $ 20.27 $ 20.27 $ 16.14