Selected Quarterly Financial Data Unaudited) (Narratives) (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended		12 Months Ended			3 Months Ended					0 Months Ended
	Sep. 30, 2014	Dec. 31, 2013	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Jun. 30, 2014	Mar. 31, 2014	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Apr. 24, 2014
Quarterly Financial Data
Gain on sale of real estate			$ 0	$ 7,987	$ 740
Out-of-period adjustment impact on net income per share	$ (0.02)	$ (0.01)
Net Income
Quarterly Financial Data
Out-of-period adjustment	(4,900)	(3,400)				(1,700)	200	2,200	500	(900)
Net income attributable to CPA 17
Quarterly Financial Data
Out-of-period adjustment	(4,900)	(3,000)				(1,700)	200	2,300	500	(900)
Ishops
Quarterly Financial Data
Gain on sale of real estate											$ 12,500