Annual report pursuant to Section 13 and 15(d)

SCHEDULE I CONDENSED FINANCIAL INFORMATION OF REGISTRANT - Parent Company Balance Sheets - (Parenthetical) (Details)

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SCHEDULE I CONDENSED FINANCIAL INFORMATION OF REGISTRANT - Parent Company Balance Sheets - (Parenthetical) (Details) - $ / shares
Dec. 31, 2020
Dec. 31, 2019
Condensed Balance Sheet Statements, Captions [Line Items]    
Preferred stock, par value (in usd per share) $ 0.01 $ 0.01
Preferred stock, shares authorized (in shares) 100,000,000 100,000,000
Preferred stock, shares outstanding (in shares) 6,123,782 6,123,782
Common stock, par value (in usd per share) $ 0.01 $ 0.01
Common stock, shares authorized (in shares) 800,000,000 400,000,000
Common stock, shares, outstanding (in shares) 354,315,739 242,207,522
Parent company    
Condensed Balance Sheet Statements, Captions [Line Items]    
Preferred stock, par value (in usd per share) $ 0.01 $ 0.01
Preferred stock, shares authorized (in shares) 100,000,000 100,000,000
Preferred stock, shares outstanding (in shares) 6,123,782 6,123,782
Common stock, par value (in usd per share) $ 0.01 $ 0.01
Common stock, shares authorized (in shares) 800,000,000 400,000,000
Common stock, shares, outstanding (in shares) 354,315,739 242,207,522