Goodwill and Other Intangibles (Goodwill Activity by Segment) (Details) - USD ($) $ in Thousands	6 Months Ended
Jun. 30, 2016	Jun. 30, 2015
Goodwill [Roll Forward]
Goodwill, beginning balance	$ 1,656,374	$ 1,894,794
Goodwill allocated to dispositions and held for sale assets	(36,141)	(47,499)
Goodwill, ending balance	1,620,233	1,847,295
REI segment [Member]
Goodwill [Roll Forward]
Goodwill, beginning balance	1,410,631	1,509,396
Goodwill allocated to dispositions and held for sale assets	(36,141)	(47,499)
Goodwill, ending balance	1,374,490	1,461,897
Cole Capital Segment [Member]
Goodwill [Roll Forward]
Goodwill, beginning balance	245,743	385,398
Goodwill allocated to dispositions and held for sale assets	0	0
Goodwill, ending balance	$ 245,743	$ 385,398

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
-URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 20
-Section 45
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=6388280&loc=d3e13770-109266

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- Definition

A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

+ References

No definition available.

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- Definition

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.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (d)
-URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267

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