Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Net income	$ 101,069	$ 278,911	$ 317,459
Other comprehensive income:
Change in net unrealized (loss) gain on derivative instruments, including SL Green's/SLGOP's share of joint venture net unrealized (loss) gain on derivative instruments	1,040	28,508	(1,229)
Change in unrealized gain on marketable securities	(4,667)	3,677	(607)
Other comprehensive (loss) income	(3,627)	32,185	(1,836)
Comprehensive income	97,442	311,096	315,623
Net loss (income) attributable to noncontrolling interests and preferred units distributions	305	(29,015)	(33,375)
Net loss (income) attributable to noncontrolling interests	15,701	(7,644)	(15,843)
Other comprehensive income (loss) attributable to noncontrolling interests	94	(1,299)	67
Comprehensive income attributable to SL Green/SLGOP	97,841	280,782	282,315
SL Green Operating Partnership
Net income	101,069	278,911	317,459
Other comprehensive income:
Change in net unrealized (loss) gain on derivative instruments, including SL Green's/SLGOP's share of joint venture net unrealized (loss) gain on derivative instruments	1,040	28,508	(1,229)
Change in unrealized gain on marketable securities	(4,667)	3,677	(607)
Other comprehensive (loss) income	(3,627)	32,185	(1,836)
Comprehensive income	97,442	311,096	315,623
Net loss (income) attributable to noncontrolling interests	15,701	(7,644)	(15,843)
Other comprehensive income (loss) attributable to noncontrolling interests	94	(1,299)	67
Comprehensive income attributable to SL Green/SLGOP	$ 113,237	$ 302,153	$ 299,847