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Consolidated Balance Sheets (Parenthetical) - $ / shares
Jun. 30, 2019
Dec. 31, 2018
Statement of Financial Position [Abstract]    
Noncontrolling interest, units eligible towards redemption (in shares) 557,189 531,161
Common Stock, par value (in usd per share) $ 0.001 $ 0.001
Common Stock, shares authorized (in shares) 700,000,000 700,000,000
Common Stock, shares outstanding (in shares) 243,610,554 174,470,284