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Commitments and Contingencies:
 9 Months Ended
Sep. 30, 2013
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 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 $2,580 and $2,244 for the three months ended September 30, 2013 and 2012, respectively, and $7,881 and $6,329 for the nine months ended September 30, 2013 and 2012, respectively. No contingent rent was incurred during the three and nine months ended September 30, 2013 or 2012.
As of September 30, 2013 and December 31, 2012, the Company was contingently liable for $3,657 and $3,757, respectively, 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 September 30, 2013, the Company had $12,359 in outstanding obligations which it believes will be settled in the next twelve months.