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Commitments and Contingencies:	3 Months Ended
Commitments and Contingencies:	Mar. 31, 2016
Commitments and Contingencies Disclosure [Abstract]
Commitments and Contingencies:	Commitments and Contingencies: The Company has certain properties that are subject to non-cancelable operating ground 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. Ground lease rent expense was $2,511 and $2,945 for the three months ended March 31, 2016 and 2015, respectively. No contingent rent was incurred during the three months ended March 31, 2016 or 2015. As of March 31, 2016, the Company was contingently liable for $61,002 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, 2016, the Company had $62,832 in outstanding obligations which it believes will be settled in the next twelve months.