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Commitments and Contingencies:	6 Months Ended
Commitments and Contingencies:	Jun. 30, 2015
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 $2,966 and $2,708 for the three months ended June 30, 2015 and 2014, respectively, and $5,911 and $5,377 for the six months ended June 30, 2015 and 2014, respectively. No contingent rent was incurred during the three and six months ended June 30, 2015 or 2014. As of June 30, 2015, the Company was contingently liable for $2,788 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 June 30, 2015, the Company had $75,701 in outstanding obligations which it believes will be settled in the next twelve months.