Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 20
-Section 50
-Paragraph 1
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Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
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-Section 45
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Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
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Amount of increase (decrease) of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

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-Section 50
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Amount of divestiture of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

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Number of segments reported by the entity. A reportable segment is a component of an entity for which there is an accounting requirement to report separate financial information on that component in the entity's financial statements.

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Number Of Real Estate Properties, Held for Sale

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Goodwill and Other Intangibles - Goodwill Narrative (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2017 USD ($) property segment	Mar. 31, 2016 USD ($)	Dec. 31, 2016 USD ($) property
Goodwill [Line Items]
Number of segments \| segment	2
Goodwill	$ 1,462,585		$ 1,462,203
REI Segment [Member]
Goodwill [Line Items]
Number of segments \| segment	1
Goodwill	$ 1,300,000		$ 1,300,000
Number of properties classified held for sale \| property			1
Number of properties classified as held for use \| property	1
Increase to goodwill	$ 400
Goodwill allocated to dispositions and held for sale assets		$ 13,500
Cole Capital Segment [Member]
Goodwill [Line Items]
Number of segments \| segment	1
Goodwill	$ 124,800		$ 124,800