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Real Estate, Number of Properties Sold

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Amount of write-down of assets recognized in the income statement. Includes, but is not limited to, losses from tangible assets, intangible assets and goodwill.

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Amount, before unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt.

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Amount, before tax, of (gain) loss recognized for the (reversal of write-down) write-down to fair value, less cost to sell, of a disposal group. Excludes discontinued operations.

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Difference between the fair value of payments made and the carrying amount of debt which is extinguished prior to maturity.

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Cash received from the sale of real estate that is held for investment, that is, it is part of an investing activity during the period.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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Amount of cash restricted as to withdrawal or usage. Cash includes, but is not limited to, currency on hand, demand deposits with banks or financial institutions, and other accounts with general characteristics of demand deposits.

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Investments in Real Estate - Additional Information (Details) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018 USD ($)	Sep. 30, 2017 USD ($)	Sep. 30, 2018 USD ($) Property	Sep. 30, 2017 USD ($) Property
Real Estate [Line Items]
Net proceeds from sale of properties			$ 807,739	$ 186,499
Debt satisfaction charges	$ 2,228	$ (2,424)	2,228	(2,378)
Asset impairment charges	2,542	21,986	90,860	43,577
Overland Park, Kansas [Member]
Real Estate [Line Items]
Asset impairment charges			17,906
Office Building [Member] \| Cash Held in Exchange Account [Member]
Real Estate [Line Items]
Restricted cash held in exchange account	256,808		256,808
LCIF [Member]
Real Estate [Line Items]
Net proceeds from sale of properties			206,929	7,106
Debt satisfaction charges	832	0	832	0
Asset impairment charges	0	$ 6,802	23,938	$ 12,061
LCIF [Member] \| Overland Park, Kansas [Member]
Real Estate [Line Items]
Asset impairment charges			17,906
Amount in excess of fair value	19,072		19,072
LCIF [Member] \| Overland Park, Kansas [Member] \| Mortgages [Member]
Real Estate [Line Items]
Mortgages and notes payable	32,297		$ 32,297
LCIF [Member] \| Industrial Property [Member]
Real Estate [Line Items]
Number of properties sold \| Property			8
Net proceeds from sale of properties			$ 283,228
Loss (gain) on sale			(78,459)
Debt satisfaction charges			832
LCIF [Member] \| Industrial Property [Member] \| Cash Held in Exchange Account [Member]
Real Estate [Line Items]
Restricted cash held in exchange account	$ 80,137		$ 80,137
LCIF [Member] \| Office Building [Member]
Real Estate [Line Items]
Number of properties sold \| Property				2
Net proceeds from sale of properties				$ 7,591