Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Thousands	Sep. 30, 2019	Dec. 31, 2018
Restricted Cash and Cash Equivalents	$ 4,178	$ 2,658
Deferred costs accumulated amortization	107,737	101,093
Accumulated amortization of acquired lease intangible assets	247,639	219,689
Accumulated accretion of acquired lease intangible liabilities	$ 119,539	$ 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	167,562,379	167,904,593
Treasury stock, shares held at cost	435,297	390,163
Exchangeable operating partnership units aggregate redemption value	$ 51,870	$ 20,532
Partnership Interest [Member]
Restricted Cash and Cash Equivalents	4,178	2,658
Deferred costs accumulated amortization	107,737	101,093
Accumulated amortization of acquired lease intangible assets	247,639	219,689
Accumulated accretion of acquired lease intangible liabilities	$ 119,539	$ 92,746
General partner units, outstanding	167,562,379	167,904,593
Limited partner units, outstanding	746,433	349,902