Goodwill, Deferred Leasing Costs and Other Intangibles - Deferred Leasing Costs, Other Intangible Assets and Intangible Liabilities (Details) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2020	Dec. 31, 2019
Deferred Leasing Costs and Intangible Assets
Deferred leasing and other intangible assets, carrying amount	$ 1,609,025	$ 853,105
Deferred leasing and other intangible assets, accumulated amortization	(333,986)	(220,948)
Deferred leasing and other intangible assets, net carrying amount	1,275,039	632,157
Intangible Liabilities
Intangible liabilities, carrying amount	186,539	174,208
Intangible liabilities, accumulated amortization	(76,923)	(62,724)
Intangible liabilities, gross	109,616	111,484
Deferred leasing costs and lease intangible assets
Deferred Leasing Costs and Intangible Assets
Deferred leasing and other intangible assets, carrying amount	1,179,939	424,987
Deferred leasing and other intangible assets, accumulated amortization	(196,594)	(123,649)
Deferred leasing and other intangible assets, net carrying amount	983,345	301,338
Investment management intangibles
Deferred Leasing Costs and Intangible Assets
Deferred leasing and other intangible assets, carrying amount	277,761	285,233
Deferred leasing and other intangible assets, accumulated amortization	(123,055)	(96,466)
Deferred leasing and other intangible assets, net carrying amount	154,706	188,767
Customer relationships
Deferred Leasing Costs and Intangible Assets
Deferred leasing and other intangible assets, carrying amount	73,400	71,000
Deferred leasing and other intangible assets, accumulated amortization	(4,818)	(250)
Deferred leasing and other intangible assets, net carrying amount	68,582	70,750
Trade name
Deferred Leasing Costs and Intangible Assets
Deferred leasing and other intangible assets, carrying amount	39,600	39,600
Deferred leasing and other intangible assets, accumulated amortization	(3,504)	(185)
Deferred leasing and other intangible assets, net carrying amount	36,096	39,415
Intangible Liabilities
Colony trade name, indefinite intangible asset	15,500
Other
Deferred Leasing Costs and Intangible Assets
Deferred leasing and other intangible assets, carrying amount	38,325	32,285
Deferred leasing and other intangible assets, accumulated amortization	(6,015)	(398)
Deferred leasing and other intangible assets, net carrying amount	$ 32,310	$ 31,887
Minimum | DBH | Trade name
Intangible Liabilities
Useful life	5 years
Maximum | DBH | Trade name
Intangible Liabilities
Useful life	10 years