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Consolidated Balance Sheets (Parentheticals) - $ / shares
Dec. 31, 2020
Dec. 31, 2019
Statement of Financial Position [Abstract]    
Preferred stock, par value (in usd per share) $ 0.01 $ 0.01
Preferred stock, authorized (in shares) 15,000,000 15,000,000
Preferred stock, issued (in shares) 0 0
Preferred stock, outstanding (in shares) 0 0
Common stock, par value (in usd per share) $ 0.01 $ 0.01
Common stock, authorized (in shares) 1,000,000,000 1,000,000,000
Common stock, issued (in shares) 389,974,041 389,646,939
Common stock, outstanding (in shares) 379,091,544 378,764,442