Intangible Assets (Details) (USD $) In Thousands, unless otherwise specified	0 Months Ended	3 Months Ended		9 Months Ended
	Sep. 16, 2014	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013	Dec. 31, 2013
Intangible Assets [Line Items]
Recognized hedge activity	$ 800	$ (828)	$ 0	$ (828)	$ 0
Total Cost		171,495		171,495		196,147
Accumulated Amortization		(66,195)		(66,195)		(63,818)
Intangible Assets, net		105,300		105,300		132,329
In-place lease value
Intangible Assets [Line Items]
Total Cost		130,594		130,594		150,782
Accumulated Amortization		(38,403)		(38,403)		(35,607)
Intangible Assets, net		92,191		92,191		115,175
Tenant relationship value
Intangible Assets [Line Items]
Total Cost		35,186		35,186		38,692
Accumulated Amortization		(26,517)		(26,517)		(26,868)
Intangible Assets, net		8,669		8,669		11,824
Above market leases acquired
Intangible Assets [Line Items]
Total Cost		5,715		5,715		6,673
Accumulated Amortization		(1,275)		(1,275)		(1,343)
Intangible Assets, net		4,440		4,440		5,330
Below Market Leases Acquired [Member]
Intangible Assets [Line Items]
Total Cost		(53,049)		(53,049)		(81,991)
Accumulated Amortization		25,661		25,661		47,547
Intangible Assets, net		$ (27,388)		$ (27,388)		$ (34,444)