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CONSOLIDATED BALANCE SHEETS (Parenthetical) - USD ($)
$ in Thousands
Mar. 31, 2019
Dec. 31, 2018
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) 96,866,464 84,884,344
Common stock, outstanding (shares) 96,866,464 84,884,344
Variable interest held by entity, assets $ 6,585,881 $ 6,331,191
Variable interest held by entity, liabilities $ 5,925,677 $ 5,709,807