Consolidated Statements of Operations - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Income from loans and other investments
Interest and related income	$ 196,303	$ 191,982	$ 383,827	$ 396,857
Less: Interest and related expenses	82,352	84,853	160,723	189,092
Income from loans and other investments, net	113,951	107,129	223,104	207,765
Other expenses
Management and incentive fees	21,545	20,496	40,752	39,773
General and administrative expenses	10,669	11,286	21,267	23,078
Total other expenses	32,214	31,782	62,019	62,851
Decrease (increase) in current expected credit loss reserve	50,906	(56,819)	52,199	(179,521)
Income (loss) before income taxes	132,643	18,528	213,284	(34,607)
Income tax provision	175	23	276	173
Net income (loss)	132,468	18,505	213,008	(34,780)
Net income attributable to non-controlling interests	(873)	(961)	(1,511)	(1,028)
Net income (loss) attributable to Blackstone Mortgage Trust, Inc.	$ 131,595	$ 17,544	$ 211,497	$ (35,808)
Net income (loss) per share of common stock basic and diluted	$ 0.89	$ 0.13	$ 1.44	$ (0.26)
Weighted-average shares of common stock outstanding, basic and diluted	147,342,822	138,299,418	147,339,895	136,959,341