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Deferred Charges and Other Assets, net: (Details 2) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2013	Dec. 31, 2012
Allocated values of leases
Less accumulated amortization	$ (64,047)	$ (62,792)
Above-Market Leases
Allocated values of leases
Original allocated value	129,256	118,033
Less accumulated amortization	(41,930)	(46,361)
Allocated value net	87,326	71,672
Below-Market Leases
Allocated values of leases
Original allocated value	(195,814)	(164,489)
Less accumulated amortization	74,083	77,131
Allocated value net	$ (121,731)	$ (87,358)

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