Intangible Assets and Liabilities (Details 2) - USD ($) $ in Thousands	Mar. 31, 2016	Dec. 31, 2015
Amortizable intangible assets
Finite-lived intangible assets, gross	$ 696,495	$ 689,330
Less: accumulated amortization	(172,626)	(164,362)
Finite-lived intangible assets, net	523,869	524,968
Unamortizable Intangible Assets
Goodwill	304	304
Total intangible assets, gross	696,799	689,634
Total intangible assets, net	524,173	525,272
Amortizable intangible liabilities
Finite-lived intangible liabilities, gross	(118,864)	(118,097)
Less: accumulated amortization	22,917	21,396
Finite-lived intangible liabilities, net	(95,947)	(96,701)
Below-market rent
Amortizable intangible liabilities
Finite-lived intangible liabilities, gross	(117,719)	(116,952)
Less: accumulated amortization	22,882	21,364
Finite-lived intangible liabilities, net	(94,837)	(95,588)
Above-market ground lease
Amortizable intangible liabilities
Finite-lived intangible liabilities, gross	(1,145)	(1,145)
Less: accumulated amortization	35	32
Finite-lived intangible liabilities, net	(1,110)	(1,113)
In-place lease and tenant relationships
Amortizable intangible assets
Finite-lived intangible assets, gross	593,874	588,858
Less: accumulated amortization	(150,239)	(143,635)
Finite-lived intangible assets, net	443,635	445,223
Above-market rent intangible assets, net
Amortizable intangible assets
Finite-lived intangible assets, gross	90,212	88,288
Less: accumulated amortization	(22,017)	(20,405)
Finite-lived intangible assets, net	68,195	67,883
Below-market ground lease
Amortizable intangible assets
Finite-lived intangible assets, gross	12,409	12,184
Less: accumulated amortization	(370)	(322)
Finite-lived intangible assets, net	$ 12,039	$ 11,862