Segment Information (Details 2) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Segment revenue information
Rental revenue	$ 241,431	$ 221,868	$ 476,554	$ 435,989
Tenant reimbursements	11,607	6,169	21,570	12,597
Other revenue	822	609	2,604	1,632
Total revenue	253,860	228,646	500,728	450,218
Apparel
Segment revenue information
Rental revenue	5,005	4,276	10,009	8,077
Automotive service
Segment revenue information
Rental revenue	4,816	4,437	9,160	8,469
Automotive tire services
Segment revenue information
Rental revenue	7,259	7,086	14,328	14,138
Beverages
Segment revenue information
Rental revenue	6,328	6,253	12,656	12,506
Child care
Segment revenue information
Rental revenue	4,863	4,996	9,882	9,984
Convenience stores
Segment revenue information
Rental revenue	22,587	22,525	45,132	44,629
Dollar stores
Segment revenue information
Rental revenue	21,943	21,676	43,890	41,199
Drug stores
Segment revenue information
Rental revenue	25,856	21,141	48,424	41,405
Financial services
Segment revenue information
Rental revenue	4,263	4,202	8,528	8,323
Grocery stores
Segment revenue information
Rental revenue	7,454	6,710	14,735	12,600
Health and fitness
Segment revenue information
Rental revenue	17,396	15,466	33,411	30,314
Health care
Segment revenue information
Rental revenue	4,016	4,018	8,031	8,005
Home improvement
Segment revenue information
Rental revenue	5,506	3,082	10,684	5,853
Restaurants-casual dining
Segment revenue information
Rental revenue	9,425	9,610	18,819	19,327
Restaurants-quick service
Segment revenue information
Rental revenue	9,584	7,868	19,980	16,597
Sporting goods
Segment revenue information
Rental revenue	4,878	3,708	8,577	7,113
Theaters
Segment revenue information
Rental revenue	12,286	11,548	24,476	23,077
Transportation services
Segment revenue information
Rental revenue	12,251	11,503	25,202	22,786
Wholesale club
Segment revenue information
Rental revenue	9,341	9,245	18,683	17,997
Other non-reportable segments
Segment revenue information
Rental revenue	$ 46,374	$ 42,518	$ 91,947	$ 83,590