Segment Information (Details 2) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
Segment revenue information
Rental revenue	$ 214,122	$ 167,798
Tenant reimbursements	6,427	6,027
Other revenue	1,023	1,697
Total revenue	221,572	175,522
Apparel
Segment revenue information
Rental revenue	3,728	3,378
Automotive service
Segment revenue information
Rental revenue	3,840	3,779
Automotive tire services
Segment revenue information
Rental revenue	7,068	6,504
Beverages
Segment revenue information
Rental revenue	6,253	6,179
Child care
Segment revenue information
Rental revenue	4,988	5,175
Convenience stores
Segment revenue information
Rental revenue	22,105	19,946
Dollar stores
Segment revenue information
Rental revenue	19,458	9,589
Drug stores
Segment revenue information
Rental revenue	20,263	10,262
Financial services
Segment revenue information
Rental revenue	4,101	3,145
Food processing
Segment revenue information
Rental revenue	3,005	2,669
Grocery stores
Segment revenue information
Rental revenue	5,964	5,359
Health and fitness
Segment revenue information
Rental revenue	14,848	10,303
Health care
Segment revenue information
Rental revenue	3,987	2,982
Restaurants-casual dining
Segment revenue information
Rental revenue	9,757	9,198
Restaurants-quick service
Segment revenue information
Rental revenue	8,729	7,941
Theaters
Segment revenue information
Rental revenue	11,529	11,508
Transportation services
Segment revenue information
Rental revenue	11,282	8,631
Wholesale clubs
Segment revenue information
Rental revenue	8,751	5,956
Other non-reportable segments
Segment revenue information
Rental revenue	$ 44,466	$ 35,294