Goodwill and Other Intangibles - Intangible Assets and Liabilities Summary (Details) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Finite-Lived Intangible Assets
Less: accumulated amortization	$ (539,495)	$ (512,392)
Indefinite-Lived Goodwill and Intangible Assets
Indefinite-lived intangible assets	640,761	686,679
Total intangible assets, gross	2,463,084	2,617,655
Total intangible assets, net	1,923,589	2,105,263
Finite-Lived Intangible Liabilities
Finite-lived intangible liabilities, gross	(146,085)	(184,251)
Less: accumulated amortization	40,593	46,647
Net amortizable intangible liabilities	(105,492)	(137,604)
Indefinite-Lived Intangible Liabilities
Total intangible liabilities, gross	(162,796)	(200,962)
Total intangible liabilities, net	(122,203)	(154,315)
Below-market purchase options
Indefinite-Lived Intangible Liabilities
Indefinite-lived intangible liabilities	(16,711)	(16,711)
Below-market rent
Finite-Lived Intangible Liabilities
Finite-lived intangible liabilities, gross	(133,137)	(171,199)
Less: accumulated amortization	38,231	44,873
Net amortizable intangible liabilities	(94,906)	(126,326)
Above-market ground lease
Finite-Lived Intangible Liabilities
Finite-lived intangible liabilities, gross	(12,948)	(13,052)
Less: accumulated amortization	2,362	1,774
Net amortizable intangible liabilities	(10,586)	(11,278)
Goodwill
Indefinite-Lived Goodwill and Intangible Assets
Indefinite-lived intangible assets	635,920	681,809
Trade name
Indefinite-Lived Goodwill and Intangible Assets
Indefinite-lived intangible assets	3,975	3,975
Below-market ground lease
Indefinite-Lived Goodwill and Intangible Assets
Indefinite-lived intangible assets	866	895
Contracts including internal software development costs
Finite-Lived Intangible Assets
Finite lived intangible assets, gross	18,568	50,953
Less: accumulated amortization	(5,068)	(34,803)
Amortizable intangible assets	13,500	16,150
Management contracts
Finite-Lived Intangible Assets
Finite lived intangible assets, gross	0	32,765
Less: accumulated amortization	0	(32,765)
Amortizable intangible assets	0	0
Internal-use software development costs
Finite-Lived Intangible Assets
Finite lived intangible assets, gross	18,568	18,188
Less: accumulated amortization	(5,068)	(2,038)
Amortizable intangible assets	13,500	16,150
Lease intangibles
Finite-Lived Intangible Assets
Finite lived intangible assets, gross	1,803,755	1,880,023
Less: accumulated amortization	(534,427)	(477,589)
Amortizable intangible assets	1,269,328	1,402,434
In-place lease and tenant relationship
Finite-Lived Intangible Assets
Finite lived intangible assets, gross	1,148,232	1,205,585
Less: accumulated amortization	(322,119)	(302,737)
Amortizable intangible assets	826,113	902,848
Above-market rent
Finite-Lived Intangible Assets
Finite lived intangible assets, gross	632,383	649,035
Less: accumulated amortization	(210,927)	(173,963)
Amortizable intangible assets	421,456	475,072
Below-market ground lease
Finite-Lived Intangible Assets
Finite lived intangible assets, gross	23,140	25,403
Less: accumulated amortization	(1,381)	(889)
Amortizable intangible assets	$ 21,759	$ 24,514