Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Thousands	Sep. 30, 2015	Dec. 31, 2014
Tenant and other receivables, allowance	$ 15,712	$ 18,068
Deferred rents receivable, allowance	22,190	27,411
Debt and preferred equity investments, discount	$ 16,169	$ 19,172
Preferred stock, par value (in dollars per share)	$ 0.01
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	103,383,000	100,928,000
Common stock, shares outstanding	103,383,000	100,928,000
Treasury stock, shares	3,724,000	3,603,000
Series I Preferred Stock
Preferred stock, par value (in dollars per share)	$ 0.01	$ 0.01
Preferred stock, liquidation preference (in dollars per share)	$ 25.00	$ 25.00
Preferred stock, shares issued	9,200,000	9,200,000
Preferred stock, shares outstanding	9,200,000	9,200,000
SL Green Operating Partnership
Tenant and other receivables, allowance	$ 15,712	$ 18,068
Deferred rents receivable, allowance	22,190	27,411
Debt and preferred equity investments, discount	$ 16,169	$ 19,172
SL Green partner's capital, general partner common units outstanding (shares)	1,035,000	1,013,000
SL Green partners' capital, limited partner common units outstanding (shares)	98,624,000	96,312,000
Limited partner interests in Operating Partnership, limited partner common units outstanding (shares)	3,875,000	3,973,000
SL Green Operating Partnership | Series I Preferred Stock
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