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Real Estate - Schedule of Real Estate Assets (Details) - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018
Real Estate Properties [Line Items]
Land, at cost	$ 407,970	$ 470,339
Buildings and improvements, at cost	1,465,672	1,605,994
Less: accumulated depreciation	(252,638)	(305,314)
Real estate, net	1,621,004	1,771,019
Real estate available and held for sale	253,336	22,551
Total real estate	1,874,340	1,793,570
Net Lease
Real Estate Properties [Line Items]
Land, at cost	302,199	336,740
Buildings and improvements, at cost	1,389,332	1,487,270
Less: accumulated depreciation	(241,686)	(287,516)
Real estate, net	1,449,845	1,536,494
Real estate available and held for sale	219,184	1,055
Total real estate	1,669,029	1,537,549
Operating Properties
Real Estate Properties [Line Items]
Land, at cost	105,771	133,599
Buildings and improvements, at cost	76,340	118,724
Less: accumulated depreciation	(10,952)	(17,798)
Real estate, net	171,159	234,525
Real estate available and held for sale	34,152	21,496
Total real estate	205,311	256,021
Residential Condominiums
Real Estate Properties [Line Items]
Real estate available and held for sale	$ 16,100	$ 20,600

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Carrying amount as of the balance sheet date of investments in land and buildings held for sale, including real estate considered to be inventory of the entity.

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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.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-03.1(d))
-URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910

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

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-Topic 210
-SubTopic 10
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-Paragraph 1
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The cumulative amount of depreciation for real estate property held for investment purposes.

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Amount of real estate investment property, net of accumulated depreciation, which may include the following: (1) land available-for-sale; (2) land available-for-development; (3) investments in building and building improvements; (4) tenant allowances; (5) developments in-process; (6) rental properties; and (7) other real estate investments.

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