Consolidated Statements of Operations - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Income from loans and other investments
Interest and related income	$ 779,648	$ 882,679	$ 756,109
Less: Interest and related expenses	347,471	458,503	359,625
Income from loans and other investments, net	432,177	424,176	396,484
Other expenses
Management and incentive fees	77,916	78,435	74,834
General and administrative expenses	45,871	38,854	35,529
Total other expenses	123,787	117,289	110,363
Increase in current expected credit loss reserve	(167,653)
Income before income taxes	140,737	306,887	286,121
Income tax provision (benefit)	323	(506)	308
Net income	140,414	307,393	285,813
Net income attributable to non-controlling interests	(2,744)	(1,826)	(735)
Net income attributable to Blackstone Mortgage Trust, Inc.	$ 137,670	$ 305,567	$ 285,078
Net income per share of common stock basic and diluted	$ 0.97	$ 2.35	$ 2.50
Weighted-average shares of common stock outstanding, basic and diluted	141,795,977	130,085,398	113,857,238