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Real Estate - Schedule of Real Estate Assets (Details) - USD ($) $ in Thousands	Sep. 30, 2019	May 31, 2019	Dec. 31, 2018
Real Estate Properties [Line Items]
Land, at cost	$ 307,384		$ 470,339
Buildings and improvements, at cost	1,449,140		1,605,994
Less: accumulated depreciation	(226,408)		(305,314)
Real estate, net	1,530,116		1,771,019
Real estate available and held for sale	12,688		22,551
Total real estate	1,542,804		1,793,570
Net investment in leases	421,252	$ 424,100
Real estate assets derecognized at inception of sales-type lease		$ 193,400
Net Lease
Real Estate Properties [Line Items]
Land, at cost	201,197		336,740
Buildings and improvements, at cost	1,342,319		1,487,270
Less: accumulated depreciation	(213,618)		(287,516)
Real estate, net	1,329,898		1,536,494
Real estate available and held for sale	0		1,055
Total real estate	1,329,898		1,537,549
Operating Properties
Real Estate Properties [Line Items]
Land, at cost	106,187		133,599
Buildings and improvements, at cost	106,821		118,724
Less: accumulated depreciation	(12,790)		(17,798)
Real estate, net	200,218		234,525
Real estate available and held for sale	12,688		21,496
Total real estate	212,906		256,021
Residential Condominiums
Real Estate Properties [Line Items]
Real estate available and held for sale	$ 11,700		$ 20,600

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Derecognized Real Estate Assets, Inception Of Sales Type Lease

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Real Estate Investment Property, Held for Use, Net

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Aggregate of the carrying amounts as of the balance sheet date of investments in building and building improvements.

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Amount before accumulated depletion of real estate held for productive use, excluding land held for sale.

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