Intangible Assets and Liabilities (Details 2) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2014	Dec. 31, 2013
Amortizable intangible assets
Finite-lived intangible assets, gross	$ 662,586	$ 655,056
Less: accumulated amortization	(118,524)	(96,818)
Finite-lived intangible assets, net	544,062	558,238
Unamortizable Intangible Assets
Goodwill	342	4,062
Total intangible assets, gross	662,928	659,118
Total intangible assets, net	544,404	562,300
Amortizable intangible liabilities
Finite-lived intangible liabilities, gross	(114,221)	(110,763)
Less: accumulated amortization	10,883	8,166
Finite-lived intangible liabilities, net	(103,338)	(102,597)
Below-market rent
Amortizable intangible liabilities
Finite-lived intangible liabilities, gross	(113,076)	(110,606)
Less: accumulated amortization	10,873	8,163
Finite-lived intangible liabilities, net	(102,203)	(102,443)
Above-market ground lease
Amortizable intangible liabilities
Finite-lived intangible liabilities, gross	(1,145)	(157)
Less: accumulated amortization	10	3
Finite-lived intangible liabilities, net	(1,135)	(154)
In-place lease
Amortizable intangible assets
Finite-lived intangible assets, gross	544,633	537,271
Less: accumulated amortization	(98,942)	(80,027)
Finite-lived intangible assets, net	445,691	457,244
Above-market rent
Amortizable intangible assets
Finite-lived intangible assets, gross	97,315	97,109
Less: accumulated amortization	(14,974)	(12,413)
Finite-lived intangible assets, net	82,341	84,696
Tenant relationship
Amortizable intangible assets
Finite-lived intangible assets, gross	13,514	13,552
Less: accumulated amortization	(4,469)	(4,299)
Finite-lived intangible assets, net	9,045	9,253
Below-market ground lease
Amortizable intangible assets
Finite-lived intangible assets, gross	7,124	7,124
Less: accumulated amortization	(139)	(79)
Finite-lived intangible assets, net	$ 6,985	$ 7,045