The aggregate amount of write-downs for impairments recognized during the period for long-lived assets held for abandonment, exchange or sale.

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Percentage investment held by members or limited partners of limited liability company (LLC) or limited partnership (LP).

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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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Assets Held for Sale - Narrative (Details) - USD ($) $ in Thousands		3 Months Ended		9 Months Ended
	Oct. 08, 2019	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Long Lived Assets Held-for-sale [Line Items]
Impairment charges		$ 1,189	$ 0	$ 16,023	$ 0
New York 12 [Member] \| Held for sale [Member]
Long Lived Assets Held-for-sale [Line Items]
Impairment charges				$ 16,000
Joint Venture [Member] \| Equinix, Inc. [Member] \| Subsequent event [Member]
Long Lived Assets Held-for-sale [Line Items]
Ownership interest	20.00%
Joint Venture [Member] \| GIC, Singapore Sovereign Wealth Fund [Member] \| Subsequent event [Member]
Long Lived Assets Held-for-sale [Line Items]
Ownership interest	80.00%