Fair Value Measurements (Tables)

12 Months Ended

Dec. 31, 2013

Fair Value Disclosures [Abstract]

Fair Value, Assets Measured on Recurring Basis [Table Text Block]

The following table presents the placement in the fair value hierarchy of assets and liabilities that are measured at fair value on a recurring basis as of December 31, 2013 and 2012 (in thousands):

		Fair Value Measurements as of December 31, 2013
				Quoted Prices in Active Markets for Identical Assets	Significant Other Observable Inputs		Significant Unobservable Inputs
		Balance		(Level 1)	(Level 2)		(Level 3)
Assets:
Trading securities held in trust	$	26,681		26,681	—		—
Interest rate derivatives		35,237		—	35,237		—
Total	$	61,918		26,681	35,237		—
Liabilities:
Interest rate derivatives	$	(34	)	—	(34	)	—

		Fair Value Measurements as of December 31, 2012
				Quoted Prices in Active Markets for Identical Assets	Significant Other Observable Inputs		Significant Unobservable Inputs
		Balance		(Level 1)	(Level 2)		(Level 3)
Assets:
Trading securities held in trust	$	23,429		23,429	—		—
Interest rate derivatives		4,307		—	4,307		—
Total	$	27,736		23,429	4,307		—
Liabilities:
Interest rate derivatives	$	(76	)	—	(76	)	—

Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Table Text Block]

December 31, 2013 and 2012 (in thousands):

		Fair Value Measurements as of December 31, 2013
			Quoted Prices in Active Markets for Identical Assets	Significant Other Observable Inputs	Significant Unobservable Inputs	Total Losses
Assets:		Balance	(Level 1)	(Level 2)	(Level 3)
Long-lived asset held and used
Operating property	$	4,686	—	—	4,686	(6,000	)

Long-lived assets held and used are comprised primarily of real estate. During the year ended December 31, 2013, the Company recognized a $6.0 million impairment on a single operating property as a result of an unoccupied anchor declaring bankruptcy, and the inability of the Company, thus far, to re-lease the anchor space.

		Fair Value Measurements as of December 31, 2012
			Quoted Prices in Active Markets for Identical Assets	Significant Other Observable Inputs	Significant Unobservable Inputs	Total Losses(1)
Assets:		Balance	(Level 1)	(Level 2)	(Level 3)
Long-lived asset held and used
Operating property	$	49,673	—	—	49,673	(54,500	)

Fair Value Inputs, Assets, Quantitative Information [Table Text Block]

December 31, 2013 and 2012:

	2013	2012
		Low	High
Overall cap rates	8.0%	8.3%	8.5%
Rental growth rates	0.0%	(8.3)%	2.5%
Discount rates	9.0%	10.5%	10.5%
Terminal cap rates	8.5%	8.8%	8.8%