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CONSOLIDATED BALANCE SHEETS (Parenthetical) - USD ($)
$ in Thousands
Sep. 30, 2018
Dec. 31, 2017
Statement of Financial Position [Abstract]    
Common stock, par value (usd per share) $ 0.01 $ 0.01
Common stock, shares authorized (shares) 180,000,000 180,000,000
Common stock, issued (shares) 82,930,281 76,599,972
Common stock, outstanding (shares) 82,930,281 76,599,972
Variable interest held by entity, assets $ 3,693,140 $ 1,259,774
Variable interest held by entity, liabilities $ 3,417,835 1,167,157
Convertible notes   $ 250,000