Fair Value of Financial Instruments (Details) (USD $)	Jun. 30, 2011	Dec. 31, 2010
Fair value and carrying values for notes and bonds payable, mortgage notes receivable and notes receivable [Abstract]
Notes and bonds payable	$ 1,251,629,000	$ 1,407,855,000
Mortgage notes receivable	122,603,000	36,599,000
Carrying value [Member]
Fair value and carrying values for notes and bonds payable, mortgage notes receivable and notes receivable [Abstract]
Notes and bonds payable	1,251,600,000	1,407,900,000
Mortgage notes receivable	122,600,000	36,600,000
Notes receivable, net of allowances	300,000	3,800,000
Fair value [Member]
Fair value and carrying values for notes and bonds payable, mortgage notes receivable and notes receivable [Abstract]
Notes and bonds payable, Fair Value	1,323,000,000	1,460,200,000
Mortgage notes receivable, Fair Value	117,600,000	35,900,000
Notes receivable, net of allowances, Fair Value	$ 300,000	$ 3,800,000

Financial Instruments Financial Assets And Liabilities Balance Sheet Groupings.

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- Definition

+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 825
-SubTopic 10
-Section 50
-Paragraph 10
-Subparagraph (a)
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- Definition

This element represents the portion of the balance sheet assertion valued at fair value by the entity whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission. This item represents loan receivable as presented on the statement of financial position which may include mortgage loans held for investment, finance receivables held for investment, policy loans on insurance contracts, or any other loans which are due the Company as of the balance sheet date.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 114
-Paragraph 4
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009.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
-Glossary Loan
-Topic 310
-SubTopic 10
-URI http://asc.fasb.org/extlink&oid=6517073

+ Details

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- Definition

Including current and noncurrent portions, aggregate carrying amount of long-term borrowings as of the balance sheet date. May include notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt, which had initial maturities beyond one year or beyond the normal operating cycle, if longer, and after deducting unamortized discount or premiums, if any.

+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.22)
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-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-03.16)
-URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878

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-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Article 7
-Section 03
-Paragraph 16

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-Name Regulation S-X (SX)
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-Section 02
-Paragraph 20, 22
-Article 5

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- Definition

Total carrying amount of mortgage loans as of the balance sheet date.

+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 948
-SubTopic 310
-Section S99
-Paragraph 1
-Subparagraph (SX 210.12-29.6)
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-Paragraph 6
-Subparagraph (SX 210.5-04.(c) Schedule IV)
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- Definition

This element represents the portion of the balance sheet assertion valued at fair value by the entity whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission. An amount representing an agreement for an unconditional promise by the maker to pay the Company (holder) a definite sum of money at a future date(s).

+ References

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-Publisher SEC
-Name Regulation S-X (SX)
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- Definition

For an unclassified balance sheet, an amount representing an agreement for an unconditional promise by the maker to pay the Entity (holder) a definite sum of money at a future date, net of any write-downs taken for collection uncertainty on the part of the holder. Such amount may include accrued interest receivable in accordance with the terms of the note. The note also may contain provisions and related items including a discount or premium, payable on demand, secured, or unsecured, interest bearing or noninterest bearing, among a myriad of other features and characteristics. This amount does not include amounts related to receivables held-for-sale.

+ References

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-Publisher SEC
-Name Regulation S-X (SX)
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-Section 02
-Paragraph 3
-Article 5

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