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Commitments and Contingencies:
 6 Months Ended
Jun. 30, 2013
Commitments and Contingencies:  
Commitments and Contingencies:

16. 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 leases. Certain leases provide for contingent rent payments based on a percentage of base rental income, as defined in the lease. Ground rent expense was $2,666 and $1,992 for the three months ended June 30, 2013 and 2012, respectively, and $5,301 and $4,086 for the six months ended June 30, 2013 and 2012, respectively. No contingent rent was incurred during the three and six months ended June 30, 2013 or 2012.

        As of June 30, 2013 and December 31, 2012, the Company was contingently liable for $3,757 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, 2013, the Company had $15,073 in outstanding obligations which it believes will be settled in the next twelve months.