Lease Intangibles - Schedule of Amortization of Lease Intangibles (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Leases [Abstract]
Amortization of acquired in-place leases, Depreciation and amortization	$ 40,493	$ 48,023	$ 46,306
Amortization of acquired in-place leases, Discontinued operations	0	1,720	3,909
Amortization of above and below market leases, Rental income	(10,650)	(10,310)	(10,621)
Amortization of above and below market leases, Discontinued operations	$ 0	$ 775	$ 659