Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Restricted Cash and Cash Equivalents	$ 2,542	$ 2,658
Deferred costs accumulated amortization	108,381	101,093
Accumulated amortization of acquired lease intangible assets	259,310	219,689
Accumulated accretion of acquired lease intangible liabilities	$ 131,676	$ 92,746
Common stock, par value per share	$ 0.01	$ 0.01
Common stock, shares authorized	220,000,000	220,000,000
Common stock, shares issued	167,571,218	167,904,593
Treasury stock, shares held at cost	440,574	390,163
Exchangeable operating partnership units aggregate redemption value	$ 47,092	$ 20,532
General partner units, outstanding	167,571,000	167,904,000
Limited partner units, outstanding	746,000	350,000
Partnership Interest [Member]
Restricted Cash and Cash Equivalents	$ 2,542	$ 2,658
Deferred costs accumulated amortization	108,381	101,093
Accumulated amortization of acquired lease intangible assets	259,310	219,689
Accumulated accretion of acquired lease intangible liabilities	$ 131,676	$ 92,746
General partner units, outstanding	167,571,218	167,904,593
Limited partner units, outstanding	746,433	349,902