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Consolidated Balance Sheets (Parenthetical) - USD ($)
$ in Thousands
Dec. 31, 2019
Dec. 31, 2018
Statement of Financial Position [Abstract]    
Common stock, par value (in dollars per share) $ 0.01 $ 0.01
Common stock, shares authorized (in shares) 270,000,000 180,000,000
Common stock, issued (in shares) 114,353,036 84,884,344
Common stock, outstanding (in shares) 114,353,036 84,884,344
Variable interest held by entity, assets $ 11,931,869 $ 6,331,191
Variable interest held by entity, liabilities $ 10,717,072 5,709,807
Convertible notes   $ 201,000