Segment Information (Details) (USD $) In Thousands, unless otherwise specified	9 Months Ended
	Sep. 30, 2013 segment	Dec. 31, 2012
Segment Information
Number of activity segments	48
Reconciliation of assets from segment to consolidated
Net real estate	$ 8,721,078	$ 5,042,137
Goodwill	15,739	16,945
Other corporate assets	188,217	142,156
Total assets	9,880,927	5,443,363
Automotive service
Reconciliation of assets from segment to consolidated
Net real estate	114,319	96,830
Intangible assets	3,346
Goodwill	470	471
Automotive tire services
Reconciliation of assets from segment to consolidated
Net real estate	260,783	184,601
Intangible assets	16,142	470
Goodwill	865	865
Beverages
Reconciliation of assets from segment to consolidated
Net real estate	307,347	310,555
Intangible assets	3,119	3,313
Child care
Reconciliation of assets from segment to consolidated
Net real estate	58,137	61,747
Goodwill	5,160	5,276
Convenience stores
Reconciliation of assets from segment to consolidated
Net real estate	776,483	672,109
Intangible assets	13,938
Goodwill	2,049	2,064
Dollar stores
Reconciliation of assets from segment to consolidated
Net real estate	804,024	450,566
Intangible assets	46,874	12,475
Drug stores
Reconciliation of assets from segment to consolidated
Net real estate	912,878	159,482
Intangible assets	187,131	14,885
Financial services
Reconciliation of assets from segment to consolidated
Net real estate	254,177	25,166
Intangible assets	41,394	4,443
Food processing
Reconciliation of assets from segment to consolidated
Net real estate	131,206	102,964
Intangible assets	24,184	21,785
Grocery stores
Reconciliation of assets from segment to consolidated
Net real estate	284,665	219,216
Intangible assets	23,424	5,650
Health and fitness
Reconciliation of assets from segment to consolidated
Net real estate	480,030	330,503
Intangible assets	60,460	15,056
Health care
Reconciliation of assets from segment to consolidated
Net real estate	228,471	4,562
Intangible assets	38,381
Home improvement
Reconciliation of assets from segment to consolidated
Net real estate	136,558	55,149
Intangible assets	21,989
Restaurants-casual dining
Reconciliation of assets from segment to consolidated
Net real estate	483,578	448,569
Intangible assets	12,163
Goodwill	2,349	2,430
Restaurant-quick service
Reconciliation of assets from segment to consolidated
Net real estate	320,932	250,692
Intangible assets	16,447	3,464
Goodwill	1,150	1,176
Theaters
Reconciliation of assets from segment to consolidated
Net real estate	371,176	381,123
Intangible assets	24,819	28,475
Transportation services
Reconciliation of assets from segment to consolidated
Net real estate	624,524	130,203
Intangible assets	110,446	27,997
Wholesale club
Reconciliation of assets from segment to consolidated
Net real estate	458,866	308,202
Intangible assets	33,977
Other non-reportable segments
Reconciliation of assets from segment to consolidated
Net real estate	1,712,924	849,898
Intangible assets	277,659	104,112
Goodwill	$ 3,696	$ 4,663
Number of non-reportable segments	30	30