Summary of Significant Accounting Policies (Details 2) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2014 segment	Dec. 31, 2013	Dec. 31, 2012
Intangible Assets and Liabilities
Intangible assets, indefinite and finite	$ 113,174	$ 116,150
Intangible liabilities	3,180	5,572
Amortization period of intangible assets	20 years
Amortization period of intangible liabilities	10 years
Amortization expenses of intangible assets	2,976	3,752	4,796
Amortization expenses of intangible liabilities	2,392	2,941	653
Deferred Financing Costs
Deferred financing costs, net of accumulated amortization	20,484	13,489
Accumulated amortization	9,379	14,901
Future amortization of deferred financing fees in 2015	3,971
Future amortization of deferred financing fees in 2016	3,848
Future amortization of deferred financing fees in 2017	3,555
Future amortization of deferred financing fees in 2018	2,980
Future amortization of deferred financing fees in 2019	1,488
Future amortization of deferred financing fees, thereafter	4,642
Revenue recognition
Straight line rental income	2,111	2,428	252
Percentage rental income	2,896	2,102	4,338
Straight line rent receivables	21,866	19,755
Segment information
Number of reportable business segments	2
Income taxes
Minimum percentage of likelihood of realization of tax benefits	50.00%
Tradenames and trademarks
Intangible Assets and Liabilities
Intangible assets, indefinite	89,375	89,375
Below Market Ground Leases
Intangible Assets and Liabilities
Intangible assets (liabilities)	21,317	23,472
Accumulated amortization, intangible assets	16,990	14,835
Future amortization expense, Intangible Assets
Total future amortization expenses	21,317	23,472
Above market ground leases
Intangible Assets and Liabilities
Intangible liabilities	3,180	3,833
Accumulated amortization, intangible liabilities	5,189	4,536
Other
Intangible Assets and Liabilities
Intangible assets (liabilities)	2,482	3,303
Intangible liabilities		1,739
Accumulated amortization, intangible assets	1,395	574
Accumulated amortization, intangible liabilities	0	2,289
Future amortization expense, Intangible Assets
Total future amortization expenses	2,482	3,303
Below Market Ground Leases & Other
Intangible Assets and Liabilities
Intangible assets (liabilities)	23,799
Future amortization expense, Intangible Assets
2015	2,320
2016	2,262
2017	2,262
2018	2,083
2019	1,707
Thereafter	13,165
Total future amortization expenses	23,799
Above Market Ground Leases & Other
Intangible Assets and Liabilities
Intangible assets (liabilities)	(3,180)
Future amortization expense, Intangible Assets
2015	(529)
2016	(455)
2017	(455)
2018	(455)
2019	(447)
Thereafter	(839)
Total future amortization expenses	$ (3,180)