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Investments in Real Estate and Real Estate Under Construction Investments in Real Estate and Real Estate Under Construction Narrative (Details) (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 6 Months Ended |  | 6 Months Ended | 0 Months Ended | 6 Months Ended |
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Jun. 30, 2013 properties states sqft | Jun. 30, 2012 | Jun. 30, 2013 properties states sqft | Jun. 30, 2012 | Dec. 31, 2012 | Jun. 30, 2013 Development Deals [Member] | Jun. 30, 2012 Development Deals [Member] | Sep. 01, 2012 Net Lease Strategic Assets Fund L P [Member] states sqft properties | Jun. 30, 2013 Net Lease Strategic Assets Fund L P [Member] | Jun. 30, 2012 Net Lease Strategic Assets Fund L P [Member] | Jun. 30, 2013 Office Property [Member] Omaha, Nebraska Acquistion [Member] Omaha, Nebraska [Member] | Sep. 01, 2012 Common Shares [Member] Net Lease Strategic Assets Fund L P [Member] | Sep. 01, 2012 Preferred Shares [Member] Net Lease Strategic Assets Fund L P [Member]
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Development in Process | $ 23,099 |  | $ 23,099 |  | $ 65,122 |  |  |  |  |  |  |  |
Business Combination, Acquisition Related Costs |  |  | 250 | 380 |  |  |  |  |  |  |  |  |
Real Estate Investment Capitalized Interest |  |  |  |  |  | 1,116 | 1,046 |  |  |  |  |  |
Business acquisition, cash paid |  |  |  |  |  |  |  | 9,438 |  |  | 39,125 |  |
Lease Term (Years) |  |  |  |  |  |  |  |  |  |  | 20 years |  |
Business acquisition, equity interest in acquiree prior to combination, percentage |  |  |  |  |  |  |  |  |  |  |  | 15.00% | 100.00%
Number of Real Estate Properties | 215 |  | 215 |  |  |  |  | 41 |  |  |  |  |
Square feet of property | 1,163,000 |  | 1,163,000 |  |  |  |  | 5,800,000 |  |  |  |  |
Number of States in which Entity has Interests | 41 |  | 41 |  |  |  |  | 23 |  |  |  |  |
Tenant-in-common interest, ownership percentage |  |  |  |  |  |  |  | 40.00% |  |  |  |  |
Real Estate Revenue, Net | 99,413 | 80,829 | 194,943 | 158,245 |  |  |  |  | 21,505 |  |  |  |
Net loss | 7,832 | 5,626 | 5,709 | 11,104 |  |  |  |  | (3,542) |  |  |  |
Equity in earnings | $ 204 | $ 10,277 | $ 339 | $ 17,670 |  |  |  |  |  | $ 9,306 |  |  |

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- Definition This element represents acquisition-related costs incurred to effect a business combination which costs have been expensed during the period. Such costs include finder's fees; advisory, legal, accounting, valuation, and other professional or consulting fees; general administrative costs, including the costs of maintaining an internal acquisitions department; and may include costs of registering and issuing debt and equity securities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 25 -Paragraph 23 -URI http://asc.fasb.org/extlink&oid=21917927&loc=d3e1043-128460 + Details
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- Definition The current amount of expenditures for a real estate project that has not yet been completed. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03.10) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 + Details
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- Definition This item represents the entity's proportionate share for the period of the net income (loss) of its investee (such as unconsolidated subsidiaries and joint ventures) to which the equity method of accounting is applied. This item includes income or expense related to stock-based compensation based on the investor's grant of stock to employees of an equity method investee. + 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 9 -Article 5 Reference 3: 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 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.12) -URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Paragraph 11 -Article 7 + Details
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- Definition The cash outflow associated with the acquisition of business during the period. The cash portion only of the acquisition price. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Investing Activities -URI http://asc.fasb.org/extlink&oid=6516133 Reference 2: 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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