Segment Information (Details) (USD $) In Thousands, unless otherwise specified	6 Months Ended
	Jun. 30, 2014 segment	Dec. 31, 2013
Segment Information
Number of activity segments	48
Reconciliation of assets from segment to consolidated
Net real estate	$ 9,621,129	$ 8,796,609
Goodwill	15,556	15,660
Other corporate assets	127,578	176,713
Total assets	10,812,402	9,924,441
Apparel
Reconciliation of assets from segment to consolidated
Net real estate	177,160	114,126
Intangible assets	53,167	37,553
Automotive service
Reconciliation of assets from segment to consolidated
Net real estate	107,348	109,324
Intangible assets	3,079	3,248
Goodwill	453	454
Automotive tire services
Reconciliation of assets from segment to consolidated
Net real estate	259,204	258,403
Intangible assets	15,430	15,770
Goodwill	865	865
Beverages
Reconciliation of assets from segment to consolidated
Net real estate	304,139	306,278
Intangible assets	2,926	3,055
Child care
Reconciliation of assets from segment to consolidated
Net real estate	55,606	56,599
Goodwill	5,132	5,141
Convenience stores
Reconciliation of assets from segment to consolidated
Net real estate	767,949	766,472
Intangible assets	18,286	13,342
Goodwill	2,031	2,031
Dollar stores
Reconciliation of assets from segment to consolidated
Net real estate	1,174,859	824,274
Intangible assets	61,039	50,209
Drug stores
Reconciliation of assets from segment to consolidated
Net real estate	1,002,563	943,401
Intangible assets	190,077	180,506
Financial services
Reconciliation of assets from segment to consolidated
Net real estate	265,762	252,764
Intangible assets	42,033	40,112
Food processing
Reconciliation of assets from segment to consolidated
Net real estate	135,636	138,000
Intangible assets	24,110	25,297
Grocery stores
Reconciliation of assets from segment to consolidated
Net real estate	336,253	280,047
Intangible assets	43,849	22,073
Health and fitness
Reconciliation of assets from segment to consolidated
Net real estate	549,349	493,981
Intangible assets	67,222	53,703
Health care
Reconciliation of assets from segment to consolidated
Net real estate	230,002	228,491
Intangible assets	37,550	38,465
Restaurants-casual dining
Reconciliation of assets from segment to consolidated
Net real estate	465,496	477,130
Intangible assets	11,277	11,906
Goodwill	2,300	2,328
Restaurants-quick service
Reconciliation of assets from segment to consolidated
Net real estate	303,722	312,474
Intangible assets	17,405	17,936
Goodwill	1,097	1,131
Theaters
Reconciliation of assets from segment to consolidated
Net real estate	375,486	367,830
Intangible assets	23,986	23,600
Transportation services
Reconciliation of assets from segment to consolidated
Net real estate	660,701	623,541
Intangible assets	107,316	107,296
Wholesale clubs
Reconciliation of assets from segment to consolidated
Net real estate	471,905	455,875
Intangible assets	41,629	33,221
Other non-reportable segments
Reconciliation of assets from segment to consolidated
Net real estate	1,977,989	1,787,599
Intangible assets	287,758	258,167
Goodwill	$ 3,678	$ 3,710
Number of non-reportable segments	30	30