Noncontrolling Interests (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended	9 Months Ended				9 Months Ended
	Sep. 30, 2013	Sep. 30, 2013	Sep. 30, 2013	Sep. 30, 2013 Tau Operating Partnership, L.P.	Jan. 22, 2013 Tau Operating Partnership, L.P.	Sep. 30, 2013 Realty Income, L.P.	Jun. 27, 2013 Realty Income, L.P.
Noncontrolling interests
Ownership interest represented by the partnership units issued						2.20%
Partnership units, ownership interest (as a percent)					99.30%	97.80%
Conversion ratio						1
Change in the carrying value of all noncontrolling interests
Fair value of units issued at beginning of the period		$ 36,562		$ 13,962			$ 22,600
Distributions		(906)		(518)		(388)
Allocation of net income	(336)	422	(422)	153		269
Carrying value at end of the period	$ 36,078	$ 36,078	$ 36,078	$ 13,597		$ 22,481	$ 22,600