Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
Restricted Cash and Cash Equivalent	$ 2,070	$ 2,377
Deferred costs accumulated amortization	113,544	113,959
Accumulated amortization of acquired lease intangible assets	292,402	284,880
Accumulated accretion of acquired lease intangible liabilities	$ 152,783	$ 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	169,828,955	169,680,138
Treasury stock, shares held at cost	467,999	459,828
Exchangeable operating partnership units aggregate redemption value	$ 43,386	$ 34,878
Partnership Interest [Member]
Restricted Cash and Cash Equivalent	2,070	2,377
Deferred costs accumulated amortization	113,544	113,959
Accumulated amortization of acquired lease intangible assets	292,402	284,880
Accumulated accretion of acquired lease intangible liabilities	$ 152,783	$ 145,966
General partner units, outstanding	169,828,955	169,680,138
Limited partner units, outstanding	765,046	765,046