Net Income Per Common Share (Details)	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012
Net income per common share
Weighted average shares used for the basic net income per share computation	195,574,014	132,592,939	183,714,191	132,643,698
Incremental shares from share-based compensation	185,077	235,601	159,456	141,515
Adjusted weighted average shares used for diluted net income per share computation	196,099,610	132,828,540	184,165,700	132,785,213
Unvested shares from share-based compensation that were anti-dilutive	16,600	16,200	16,600	16,400
Tau Operating Partnership, L.P.
Net income per common share
Weighted average common units convertible to common shares	317,022		280,240
Realty Income, L.P.
Net income per common share
Weighted average common units convertible to common shares	23,497		11,813