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Consolidated Balance Sheets (Parenthetical) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Statement of Financial Position [Abstract]    
Common stock, par value (in dollars per share) $ 0.01 $ 0.01
Common stock, shares authorized (in shares) 180,000,000 180,000,000
Common stock, issued (in shares) 84,884,344 76,599,972
Common stock, outstanding (in shares) 84,884,344 76,599,972
Variable interest held by entity, assets $ 6,331,191 $ 1,259,774
Variable interest held by entity, liabilities 5,709,807 1,167,157
Convertible notes $ 201,000 $ 250,000