Segment Information (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2014 segment	Dec. 31, 2013
Segment Information
Number of activity segments	48
Reconciliation of assets from segment to consolidated
Net real estate	$ 9,353,225	$ 8,796,609
Goodwill	15,598	15,660
Other corporate assets	125,895	176,713
Total assets	10,480,781	9,924,441
Apparel
Reconciliation of assets from segment to consolidated
Net real estate	127,291	110,966
Intangible assets	41,200	37,249
Automotive service
Reconciliation of assets from segment to consolidated
Net real estate	108,121	108,940
Intangible assets	3,163	3,248
Goodwill	454	454
Automotive tire services
Reconciliation of assets from segment to consolidated
Net real estate	256,687	258,787
Intangible assets	15,389	15,770
Goodwill	865	865
Beverages
Reconciliation of assets from segment to consolidated
Net real estate	305,209	306,278
Intangible assets	2,990	3,055
Child care
Reconciliation of assets from segment to consolidated
Net real estate	56,036	56,599
Goodwill	5,132	5,141
Convenience stores
Reconciliation of assets from segment to consolidated
Net real estate	773,791	766,472
Intangible assets	18,656	13,342
Goodwill	2,031	2,031
Dollar stores
Reconciliation of assets from segment to consolidated
Net real estate	1,160,050	824,274
Intangible assets	58,437	50,209
Drug stores
Reconciliation of assets from segment to consolidated
Net real estate	1,011,654	943,401
Intangible assets	191,720	180,506
Financial services
Reconciliation of assets from segment to consolidated
Net real estate	266,085	252,764
Intangible assets	42,678	40,112
Food processing
Reconciliation of assets from segment to consolidated
Net real estate	136,812	138,000
Intangible assets	24,704	25,297
Grocery stores
Reconciliation of assets from segment to consolidated
Net real estate	299,728	283,207
Intangible assets	26,598	22,377
Health and fitness
Reconciliation of assets from segment to consolidated
Net real estate	544,080	493,981
Intangible assets	67,003	53,703
Health care
Reconciliation of assets from segment to consolidated
Net real estate	231,341	228,491
Intangible assets	39,102	38,465
Restaurants-casual dining
Reconciliation of assets from segment to consolidated
Net real estate	471,085	477,130
Intangible assets	11,591	11,906
Goodwill	2,319	2,328
Restaurants-quick service
Reconciliation of assets from segment to consolidated
Net real estate	304,035	312,474
Intangible assets	17,473	17,936
Goodwill	1,105	1,131
Theaters
Reconciliation of assets from segment to consolidated
Net real estate	364,493	367,830
Intangible assets	22,434	23,600
Transportation services
Reconciliation of assets from segment to consolidated
Net real estate	656,417	623,541
Intangible assets	110,458	107,296
Wholesale clubs
Reconciliation of assets from segment to consolidated
Net real estate	452,819	455,875
Intangible assets	32,505	33,221
Other non-reportable segments
Reconciliation of assets from segment to consolidated
Net real estate	1,827,491	1,787,599
Intangible assets	259,962	258,167
Goodwill	$ 3,692	$ 3,710
Number of non-reportable segments	30	30