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Investment in and Advances to Non-Consolidated Entities (Details) (USD $) | 1 Months Ended | 6 Months Ended | 12 Months Ended | 3 Months Ended | 6 Months Ended |  |  | 1 Months Ended | 12 Months Ended |  | 12 Months Ended |
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Jul. 31, 2012 | Jun. 30, 2013 sqft | Jun. 30, 2012 | Dec. 31, 2012 Partnerships | Jun. 30, 2012 Concord and CDH CDO [Member] | Jun. 30, 2012 Concord and CDH CDO [Member] | Jun. 30, 2013 Concord and CDH CDO [Member] | Jul. 31, 2012 Financial Standby Letter of Credit [Member] | Mar. 31, 2013 Palm Beach Garden, FL Office [Member] Joint Venture [Member] | Dec. 31, 2012 Palm Beach Garden, FL Office [Member] Joint Venture [Member] sqft | Jun. 30, 2013 Palm Beach Garden, FL Office [Member] Joint Venture [Member] | Dec. 31, 2012 Humble Texas [Member] Joint Venture [Member] | Dec. 31, 2012 Nonrecourse Mortgage [Member] Humble Texas [Member] Joint Venture [Member]
Investments in and Advances to Affiliates [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Equity Method Investment, Number of Joint Venture Formed During Period |  |  |  | 2 |  |  |  |  |  |  |  |  |
Square feet of property |  | 1,163,000 |  |  |  |  |  |  |  | 120,000 |  |  |
Investment in joint venture |  | $ 0 | $ 1,920,000 |  |  |  |  |  |  | $ 29,750,000 |  |  |
Equity Method Investment, Ownership Percentage |  |  |  |  |  |  |  |  |  | 36.00% | 25.00% | 15.00% |
Lease Term (Years) |  |  |  |  |  |  |  |  |  | 15 years |  | 17 years |
Advances to Affiliate |  |  |  |  |  |  |  |  |  | 12,000,000 |  |  |
Distributions Payable to Real Estate Partnerships |  |  |  |  |  |  |  |  | 2,557,000 |  |  |  |
Economic Interest in Joint Venture |  |  |  | 100.00% |  |  |  |  |  |  |  |  |
Property Purchase Price |  |  |  |  |  |  |  |  |  |  |  | 27,750,000 |
Debt Instrument, Face Amount |  |  |  |  |  |  |  |  |  |  |  |  | 15,260,000
Debt Instrument, Interest Rate, Stated Percentage |  |  |  |  |  |  |  |  |  |  |  |  | 4.70%
Proceeds from Divestiture of Interest in Consolidated Subsidiaries | 13,218,000 |  |  |  |  |  |  |  |  |  |  |  |
Guarantor Obligations, Contingent Letter of Credit |  |  |  |  |  |  |  | 2,500,000 |  |  |  |  |
Limited Liability Company (LLC) or Limited Partnership (LP), Members or Limited Partners, Ownership Interest |  |  |  |  |  |  | 0 |  |  |  |  |  |
Equity Method Investment distributions |  |  |  |  |  | 885,000 |  |  |  |  |  |  |
Equity Method Investment Sold, Carrying Amount |  |  |  |  | $ 7,000,000 |  |  |  |  |  |  |  |

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- Definition Equity Method Investment, Number of Joint Venture Formed During Period + References No definition available. + Details
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- Definition Long-Term advances receivable from a party that is affiliated with the reporting entity by means of direct or indirect ownership. This does not include advances to clients. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 946 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.6-04.2) -URI http://asc.fasb.org/extlink&oid=6488278&loc=d3e603758-122996 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section 45 -Paragraph 4 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=28358313&loc=d3e6812-107765 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Paragraph 2 -Article 6 + Details
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- Definition Face (par) amount of debt instrument at time of issuance. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6451184&loc=d3e28551-108399 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 55 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=6584090&loc=d3e28878-108400 + Details
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- Definition The cash outflow or inflow increase (decrease) in distribution due to real estate partnership based upon payments and accruals. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3179-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3213-108585 + Details
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- Definition This item represents disclosure of the amount of dividends or other distributions received from unconsolidated subsidiaries, certain corporate joint ventures, and certain noncontrolled corporation; these investments are accounted for under the equity method of accounting. This element excludes distributions that constitute a return of investment, which are classified as investing activities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 13 -Article 5 + Details
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- Definition The percentage of ownership of common stock or equity participation in the investee accounted for under the equity method of accounting. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 323 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=6382943&loc=d3e33918-111571 + Details
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- Definition This item represents the carrying amount on the entity's balance sheet of its investment in common stock of an equity method investee. This is not an indicator of the fair value of the investment, rather it is the initial cost adjusted for the entity's share of earnings and losses of the investee, adjusted for any distributions (dividends) and other than temporary impairment (OTTI) losses recognized. + 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 210.5-02.12) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 323 -SubTopic 10 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=16385135&loc=d3e33749-111570 + Details
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- Definition The cash outflow associated with the purchase of or advances to an equity method investments, which are investments in joint ventures and entities in which the entity has an equity ownership interest normally of 20 to 50 percent and exercises significant influence. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 13 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3213-108585 + Details
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