Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Thousands	Jun. 30, 2021	Dec. 31, 2020
Restricted Cash and Cash Equivalent	$ 2,580	$ 2,377
Deferred costs accumulated amortization	115,396	113,959
Accumulated amortization of acquired lease intangible assets	298,377	284,880
Accumulated accretion of acquired lease intangible liabilities	$ 159,554	$ 145,966
Common stock, par value per share	$ 0.01	$ 0.01
Common stock, shares authorized	220,000,000	220,000,000
Common stock, shares issued	169,867,162	169,680,138
Treasury stock, shares held at cost	564,015	459,828
Exchangeable operating partnership units aggregate redemption value	$ 48,696	$ 34,878
Partnership Interest [Member]
Restricted Cash and Cash Equivalent	2,580	2,377
Deferred costs accumulated amortization	115,396	113,959
Accumulated amortization of acquired lease intangible assets	298,377	284,880
Accumulated accretion of acquired lease intangible liabilities	$ 159,554	$ 145,966
General partner units, outstanding	169,867,162	169,680,138
Limited partner units, outstanding	760,046	765,046