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Property - Narrative (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Property, Plant and Equipment [Line Items]
Depreciation expenses	$ 91,124	$ 68,017	$ 181,321	$ 136,495
Impairment loss	(5,916)	(8,516)	(5,916)	(8,516)
Gain loss on sale of properties		238	1,056	238
Development cost	127	$ 1,177	198	1,102
Rotterdam Square, Somersville Town Center and Lake Square Mall
Property, Plant and Equipment [Line Items]
Gain loss on sale of properties	$ 1,372		$ 1,322	$ (1,685)

X

- Definition

Represents the development cost written off during the period.

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- Definition

The expense recognized in the current period that allocates the cost of nonproduction tangible assets over their useful lives.

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- Definition

The difference between the carrying value and the sale price of real estate or properties that were intended to be sold or held for capital appreciation or rental income. This element refers to the gain (loss) included in earnings and not to the cash proceeds of the sale. This element is a noncash adjustment to net income when calculating net cash generated by operating activities using the indirect method.

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- Definition

The aggregate amount of write-downs for impairments recognized during the period for long lived assets held for use (including those held for disposal by means other than sale).

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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