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Commitments and Contingencies	3 Months Ended
Commitments and Contingencies	Mar. 31, 2018
Commitments and Contingencies Disclosure [Abstract]
Commitments and Contingencies	Commitments and Contingencies: The Company has certain properties that are subject to non-cancelable operating leases. The leases expire at various times through 2098, subject in some cases to options to extend the terms of the lease. Certain leases provide for contingent rent payments based on a percentage of base rental income, as defined in the lease. Rent expense was $4,236 and $4,217 for the three months ended March 31, 2018 and 2017, respectively. No contingent rent was incurred during the three months ended March 31, 2018 or 2017. As of March 31, 2018, the Company was contingently liable for $60,588 in letters of credit guaranteeing performance by the Company of certain obligations relating to the Centers. The Company does not believe that these letters of credit will result in a liability to the Company. The Company has entered into a number of construction agreements related to its redevelopment and development activities. Obligations under these agreements are contingent upon the completion of the services within the guidelines specified in the agreements. At March 31, 2018, the Company had $31,916 in outstanding obligations which it believes will be settled in the next twelve months.