Goodwill and Other Intangibles (Details 3) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2014	Dec. 31, 2013
Amortizable Intangible Assets
Less: accumulated amortization	$ (262,297)	$ (168,840)
Indefinite Lived Intangible Assets Including Goodwill
Indefinite-lived intangible assets	702,866	354,183
Total intangible assets, gross	2,534,787	1,244,705
Total intangible assets, net	2,272,490	1,075,865
Amortizable Intangible Liabilities
Finite-lived intangible liabilities, gross	(182,339)	(123,835)
Less: accumulated amortization	(18,686)	(12,344)
Net amortizable intangible liabilities	(163,653)	(111,491)
Indefinite Lived Intangible Liabilities
Total intangible liabilities, gross	(199,050)	(140,546)
Total intangible liabilities, net	(180,364)	(128,202)
Below-market purchase options
Indefinite Lived Intangible Liabilities
Indefinite-lived intangible liabilities	(16,711)	(16,711)
Below-market rent
Amortizable Intangible Liabilities
Finite-lived intangible liabilities, gross	(168,723)	(116,939)
Less: accumulated amortization	(17,861)	(11,832)
Net amortizable intangible liabilities	(150,862)	(105,107)
Above-market ground lease
Amortizable Intangible Liabilities
Finite-lived intangible liabilities, gross	(13,616)	(6,896)
Less: accumulated amortization	(825)	(512)
Net amortizable intangible liabilities	(12,791)	(6,384)
Goodwill
Indefinite Lived Intangible Assets Including Goodwill
Indefinite-lived intangible assets	698,891	350,208
Trade name
Indefinite Lived Intangible Assets Including Goodwill
Indefinite-lived intangible assets	3,975	3,975
Contracts including internal software development costs
Amortizable Intangible Assets
Finite lived intangible assets, gross	41,988	36,020
Less: accumulated amortization	(32,765)	(32,395)
Amortizable intangible assets	9,223	3,625
Management contracts
Amortizable Intangible Assets
Finite lived intangible assets, gross	32,765	32,765
Less: accumulated amortization	(32,765)	(32,395)
Amortizable intangible assets	0	370
Internal-use software development costs
Amortizable Intangible Assets
Finite lived intangible assets, gross	9,223	3,255
Less: accumulated amortization	0	0
Amortizable intangible assets	9,223	3,255
Lease intangibles
Amortizable Intangible Assets
Finite lived intangible assets, gross	1,789,933	854,502
Less: accumulated amortization	(229,532)	(136,445)
Amortizable intangible assets	1,560,401	718,057
In-place lease
Amortizable Intangible Assets
Finite lived intangible assets, gross	1,108,719	551,737
Less: accumulated amortization	(142,313)	(84,610)
Amortizable intangible assets	966,406	467,127
Tenant relationship
Amortizable Intangible Assets
Finite lived intangible assets, gross	6,245	6,247
Less: accumulated amortization	(1,739)	(1,656)
Amortizable intangible assets	4,506	4,591
Above-market rent
Amortizable Intangible Assets
Finite lived intangible assets, gross	655,744	292,132
Less: accumulated amortization	(85,246)	(50,157)
Amortizable intangible assets	570,498	241,975
Below-market ground lease
Amortizable Intangible Assets
Finite lived intangible assets, gross	19,225	4,386
Less: accumulated amortization	(234)	(22)
Amortizable intangible assets	$ 18,991	$ 4,364