Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Thousands	Jun. 30, 2020	Dec. 31, 2019
Restricted Cash and Cash Equivalent	$ 3,933	$ 2,542
Deferred costs accumulated amortization	112,589	108,381
Accumulated amortization of acquired lease intangible assets	276,169	259,310
Accumulated accretion of acquired lease intangible liabilities	$ 138,335	$ 131,676
Common stock, par value per share	$ 0.01	$ 0.01
Common stock, shares authorized	220,000,000	220,000,000
Common stock, shares issued	169,664,850	167,571,218
Treasury stock, shares held at cost	466,469	440,574
Exchangeable operating partnership units aggregate redemption value	$ 35,108	$ 47,092
Partnership Interest [Member]
Restricted Cash and Cash Equivalent	3,933	2,542
Deferred costs accumulated amortization	112,589	108,381
Accumulated amortization of acquired lease intangible assets	276,169	259,310
Accumulated accretion of acquired lease intangible liabilities	$ 138,335	$ 131,676
General partner units, outstanding	169,664,850	167,571,218
Limited partner units, outstanding	765,046	746,433