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Mortgages and Notes Receivable (Details) (USD $) | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2013 | Jun. 30, 2012 | Jun. 30, 2013 | Jun. 30, 2012 | Dec. 31, 2012
Schedule of mortgages and notes receivable [Abstract] |  |  |  |  |
Mortgages and notes receivable, allowance | $ (376,000) |  | $ (376,000) |  | $ (182,000)
Mortgages and notes receivable, net | 25,583,000 |  | 25,583,000 |  | 25,472,000
Notes receivable allowance, promissory notes [Roll Forward] |  |  |  |  |
Beginning notes receivable allowance |  |  |  |  | 182,000
Total notes receivable allowance | 376,000 |  | 376,000 |  | 182,000
Seller Financing [Member] |  |  |  |  |
Schedule of mortgages and notes receivable [Abstract] |  |  |  |  |
Mortgages and notes receivable, gross | 16,113,000 |  | 16,113,000 |  | 15,853,000
Mortgages and notes receivable, allowance | 0 |  | 0 |  | 0
Mortgages and notes receivable, net | 16,113,000 |  | 16,113,000 |  | 15,853,000
Number of transactions with seller financing | 2 |  |  |  |
Notes receivable allowance, promissory notes [Roll Forward] |  |  |  |  |
Beginning notes receivable allowance |  |  |  |  | 0
Total notes receivable allowance | 0 |  | 0 |  | 0
Mortgage Receivable [Member] |  |  |  |  |
Schedule of mortgages and notes receivable [Abstract] |  |  |  |  |
Mortgages and notes receivable, gross | 8,715,000 |  | 8,715,000 |  | 8,648,000
Mortgages and notes receivable, allowance | 0 |  | 0 |  |
Mortgages and notes receivable, net | 8,715,000 |  | 8,715,000 |  | 8,648,000
Additional loan commitment to third party | 8,400,000 |  | 8,400,000 |  |
Cumulative funds for future infrastructure disbursed to third party |  |  | 100,000 |  |
Notes receivable allowance, promissory notes [Roll Forward] |  |  |  |  |
Beginning notes receivable allowance |  |  | 0 |  |
Total notes receivable allowance | 0 |  | 0 |  |
Promissory Notes [Member] |  |  |  |  |
Schedule of mortgages and notes receivable [Abstract] |  |  |  |  |
Mortgages and notes receivable, gross | 1,131,000 |  | 1,131,000 |  | 1,153,000
Mortgages and notes receivable, allowance | (376,000) | (118,000) | (376,000) | (118,000) |
Mortgages and notes receivable, net | 755,000 |  | 755,000 |  | 971,000
Notes receivable allowance, promissory notes [Roll Forward] |  |  |  |  |
Beginning notes receivable allowance | 437,000 | 122,000 | 182,000 | 61,000 |
Recoveries/write-offs/other | (61,000) | (4,000) | 194,000 | 57,000 |
Total notes receivable allowance | $ 376,000 | $ 118,000 | $ 376,000 | $ 118,000 |

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- Definition Amount of additional loan amount committed to third party for future development. + References No definition available. + Details
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- Definition Cumulative amount of funds for future infrastructure development disbursed to third party. + References No definition available. + Details
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- Definition Number of transactions with seller financing. + References No definition available. + Details
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- Definition A valuation allowance for financing receivables that are expected to be uncollectible. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=7512638&loc=SL6953423-111524 + Details
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- Definition Amount of recovery of financing receivables doubtful of collection that were previously charged off. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (c)(4) -URI http://asc.fasb.org/extlink&oid=7512638&loc=SL6953423-111524 + Details
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- Definition 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. 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. Excludes amounts related to receivables held-for-sale. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.10(3)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 10 -Subparagraph 3 -Article 9 + Details
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- Definition Net amount of the investment in a contractual right to receive money on demand or on fixed or determinable dates that is recognized as an asset in the creditor's statement of financial position. Examples include, but are not limited to, credit card receivables, notes receivable and receivables relating to lessor's rights to payments from leases other than operating leases that have been recorded as assets. Excludes trade accounts receivable with contractual maturity of one year or less and arose from the sale of goods or services. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.3) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 3 -Article 5 + Details
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