Consolidated Statements of Operations (Parenthetical) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Operating expenses, paid to related parties	$ 21,400	$ 21,890	$ 20,071
SL Green Operating Partnership
Operating expenses, paid to related parties	$ 21,400	$ 21,890	$ 20,071