Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Tenant and other receivables, allowance	$ 18,637	$ 16,592
Deferred rents receivable, allowance	17,207	25,203
Discounts and deferred origination fees	$ 25,507	$ 16,705
Preferred stock, par	$ 0.01	$ 0.01
Preferred stock, liquidation preference	$ 25.00	$ 25.00
Preferred stock, shares issued	9,200,000	9,200,000
Preferred stock, shares outstanding	9,200,000	9,200,000
Common stock, par value (in dollars per share)	$ 0.01	$ 0.01
Common stock, shares authorized	160,000,000	160,000,000
Common stock, shares issued	93,858,000	101,617,000
Common stock, shares outstanding	93,858,000	101,617,000
Treasury stock, shares	1,055,000	1,055,000
SL Green Operating Partnership
Tenant and other receivables, allowance	$ 18,637	$ 16,592
Deferred rents receivable, allowance	17,207	25,203
Discounts and deferred origination fees	$ 25,507	$ 16,705
Limited partner interests in Operating Partnership, limited partner common units outstanding (shares)	4,453,000	4,364,000
Preferred units, liquidation preference (in dollars per share)	$ 25.00	$ 25.00
Preferred units, shares issued	9,200,000	9,200,000
Preferred units, shares outstanding	9,200,000	9,200,000
SL Green partner's capital, general partner common units outstanding (shares)	973,000	1,049,000
SL Green partners' capital, limited partner common units outstanding (shares)	91,831,000	99,513,000