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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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