Condensed Consolidated Balance Sheets (Parenthetical) - $ / shares	Mar. 31, 2019	Dec. 31, 2018
Preferred Stock, Par Value	$ 0.01	$ 0.01
Preferred stock, authorized shares	100,000,000	100,000,000
Preferred stock, issued	0	0
Preferred stock, outstanding	0	0
Common stock, shares outstanding	516,036,000	438,938,000
Class S Shares [Member]
Common Stock, Par Value	$ 0.01	$ 0.01
Common stock, shares authorized	500,000,000	500,000,000
Common stock, shares issued	318,995,204	276,989,019
Common stock, shares outstanding	318,995,204	276,989,019
Class T Shares [Member]
Common Stock, Par Value	$ 0.01	$ 0.01
Common stock, shares authorized	500,000,000	500,000,000
Common stock, shares issued	26,702,162	23,313,429
Common stock, shares outstanding	26,702,162	23,313,429
Class D Shares [Member]
Common Stock, Par Value	$ 0.01	$ 0.01
Common stock, shares authorized	500,000,000	500,000,000
Common stock, shares issued	38,119,939	30,375,353
Common stock, shares outstanding	38,119,939	30,375,353
Class I Shares [Member]
Common Stock, Par Value	$ 0.01	$ 0.01
Common stock, shares authorized	500,000,000	500,000,000
Common stock, shares issued	132,218,607	108,261,331
Common stock, shares outstanding	132,218,607	108,261,331