Goodwill and Other Intangibles - Intangible Assets Narrative (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016	Dec. 31, 2016
Related Party Transaction [Line Items]
Amortization expense	$ 4,100	$ 6,200	$ 12,400	$ 19,900
Intangible assets	12,173		$ 12,173		$ 24,609
Cole REITs [Member] | Management And Advisory Contracts [Member]
Related Party Transaction [Line Items]
Estimated useful life			2 years
Estimated amortization expense for remainder of 2017	4,100		$ 4,100
Estimated amortization expense for 2018	4,000		4,000
Estimated amortization expense for nine months ended 30th September 2019	3,800		3,800
Intangible assets	12,200		12,200		24,600
Accumulated amortization	$ 42,000		$ 42,000		$ 29,600