Segment Information (Details) (USD $) In Thousands, unless otherwise specified	9 Months Ended
Sep. 30, 2012 item	Dec. 31, 2011
Segment Information
Number of industry and activity segments	45
Reconciliation of assets from segment to consolidated
Net real estate	$ 4,734,688	$ 4,160,008
Goodwill	17,010	17,206
Other corporate assets	94,047	88,838
Total assets	5,036,326	4,419,389
Automotive service
Reconciliation of assets from segment to consolidated
Net real estate	97,932	99,974
Goodwill	472	472
Automotive tire services
Reconciliation of assets from segment to consolidated
Net real estate	186,451	191,797
Intangible assets	485	529
Goodwill	866	866
Beverages
Reconciliation of assets from segment to consolidated
Net real estate	311,624	314,832
Intangible assets	3,377	3,571
Child care
Reconciliation of assets from segment to consolidated
Net real estate	62,975	66,474
Goodwill	5,296	5,353
Convenience stores
Reconciliation of assets from segment to consolidated
Net real estate	676,035	690,246
Goodwill	2,067	2,073
Dollar stores
Reconciliation of assets from segment to consolidated
Net real estate	237,642	1,327
Intangible assets	7,721
Drug stores
Reconciliation of assets from segment to consolidated
Net real estate	160,894	154,015
Intangible assets	15,215	14,422
Grocery stores
Reconciliation of assets from segment to consolidated
Net real estate	217,443	221,678
Intangible assets	5,372	5,655
Health and fitness
Reconciliation of assets from segment to consolidated
Net real estate	291,693	293,624
Intangible assets	1,459	1,566
Restaurants - casual dining
Reconciliation of assets from segment to consolidated
Net real estate	457,900	471,842
Goodwill	2,435	2,461
Restaurants- quick service
Reconciliation of assets from segment to consolidated
Net real estate	257,410	277,648
Intangible assets	3,607	4,037
Goodwill	1,221	1,318
Sporting goods
Reconciliation of assets from segment to consolidated
Net real estate	78,391	80,351
Intangible assets	4,977	5,324
Theaters
Reconciliation of assets from segment to consolidated
Net real estate	384,445	383,452
Intangible assets	29,694	31,163
Transportation services
Reconciliation of assets from segment to consolidated
Net real estate	116,483	107,632
Intangible assets	27,896	28,944
Wholesale club
Reconciliation of assets from segment to consolidated
Net real estate	310,247	154,964
Other non-reportable segments
Reconciliation of assets from segment to consolidated
Net real estate	887,123	650,152
Intangible assets	90,778	58,126
Goodwill	$ 4,653	$ 4,663
Number of non-reportable segments	30	30

Sum of the carrying amounts as of the balance sheet date of all assets that are recognized. Assets are probable future economic benefits obtained or controlled by an entity as a result of past transactions or events.

+ References+ Details

Carrying amount as of the balance sheet date, which is the cumulative amount paid and (if applicable) the fair value of any noncontrolling interest in the acquiree, adjusted for any amortization recognized prior to the adoption of any changes in generally accepted accounting principles (as applicable) and for any impairment charges, in excess of the fair value of net assets acquired in one or more business combination transactions.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 142

-Paragraph 45

-Subparagraph e

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-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 350

-SubTopic 20

-Section 50

-Paragraph 1

-URI http://asc.fasb.org/extlink&oid=14024403&loc=d3e13816-109267

Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 350

-SubTopic 20

-Section 45

-Paragraph 1

-URI http://asc.fasb.org/extlink&oid=6388280&loc=d3e13770-109266

Reference 4: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 141R

-Paragraph 68

-Subparagraph l

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 5: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 141R

-Paragraph 34

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 6: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 142

-Paragraph 43

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 7: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 142

-Paragraph 45

-Subparagraph e

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 8: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 141R

-Paragraph 72

-Subparagraph d

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

+ Details