Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Thousands	Mar. 31, 2020	Dec. 31, 2019
Restricted Cash and Cash Equivalents	$ 3,595	$ 2,542
Deferred costs accumulated amortization	110,158	108,381
Accumulated amortization of acquired lease intangible assets	268,063	259,310
Accumulated accretion of acquired lease intangible liabilities	$ 144,682	$ 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	169,620,627	167,571,218
Treasury stock, shares held at cost	449,979	440,574
Exchangeable operating partnership units aggregate redemption value	$ 29,401	$ 47,092
Partnership Interest [Member]
Restricted Cash and Cash Equivalents	3,595	2,542
Deferred costs accumulated amortization	110,158	108,381
Accumulated amortization of acquired lease intangible assets	268,063	259,310
Accumulated accretion of acquired lease intangible liabilities	$ 144,682	$ 131,676
General partner units, outstanding	169,620,627	167,571,218
Limited partner units, outstanding	765,046	746,433