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Commitments and Contingencies:
 12 Months Ended
Dec. 31, 2013
Commitments and Contingencies Disclosure [Abstract]  
Commitments and Contingencies:
Commitments and Contingencies:
The Company has certain properties 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 rent expenses were $10,579, $8,681 and $8,607 for the years ended December 31, 2013, 2012 and 2011, respectively. No contingent rent was incurred for the years ended December 31, 2013, 2012 or 2011.
Minimum future rental payments required under the leases are as follows:
Year Ending December 31,
 
2014
$
15,339

2015
15,356

2016
15,393

2017
15,378

2018
11,263

Thereafter
296,687

 
$
369,416



As of December 31, 2013, the Company was contingently liable for $18,862 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 agreement. At December 31, 2013, the Company had $57,969 in outstanding obligations, which it believes will be settled in the next twelve months.