Consolidated Statements of Operations - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Income from loans and other investments
Interest and related income	$ 756,109	$ 537,915	$ 497,974
Less: Interest and related expenses	359,625	234,870	184,270
Income from loans and other investments, net	396,484	303,045	313,704
Other expenses
Management and incentive fees	74,834	54,841	55,959
General and administrative expenses	35,529	29,922	27,716
Total other expenses	110,363	84,763	83,675
Gain on investments at fair value			13,420
Income from equity investment in unconsolidated subsidiary			3,187
Income before income taxes	286,121	218,282	246,636
Income tax provision	308	314	196
Net income	285,813	217,968	246,440
Net income attributable to non-controlling interests	(735)	(337)	(8,143)
Net income attributable to Blackstone Mortgage Trust, Inc.	$ 285,078	$ 217,631	$ 238,297
Net income per share of common stock basic and diluted	$ 2.50	$ 2.27	$ 2.53
Weighted-average shares of common stock outstanding, basic and diluted	113,857,238	95,963,616	94,165,351