Consolidated Statements of Operations - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Income from loans and other investments
Interest and related income	$ 537,915	$ 497,974	$ 410,635
Less: Interest and related expenses	234,870	184,270	152,416
Income from loans and other investments, net	303,045	313,704	258,219
Other expenses
Management and incentive fees	54,841	55,959	42,886
General and administrative expenses	29,922	27,716	36,709
Total other expenses	84,763	83,675	79,595
Gain on investments at fair value		13,420	21,967
Income from equity investment in unconsolidated subsidiary		3,187	11,798
Income before income taxes	218,282	246,636	212,389
Income tax provision	314	196	504
Net income	217,968	246,440	211,885
Net income attributable to non-controlling interests	(337)	(8,143)	(15,056)
Net income attributable to Blackstone Mortgage Trust, Inc.	$ 217,631	$ 238,297	$ 196,829
Net income per share of common stock basic and diluted	$ 2.27	$ 2.53	$ 2.41
Weighted-average shares of common stock outstanding, basic and diluted	95,963,616	94,165,351	81,740,227