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Investments in Real Estate and Real Estate Under Construction - Summary of development arrangements outstanding (Details) ft² in Thousands, $ in Thousands | 3 Months Ended |
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Mar. 31, 2017 USD ($) ft² | Dec. 31, 2016 ft²
Investments in Real Estate and Real Estate Under Construction [Line Items] |  |
Square Feet (000's) | ft² | 366 | 475
Maximum Commitment/Estimated Completion Cost | $ 99,445 |
Investment in real estate under construction | $ 69,128 |
Charlotte, North Carolina [Member] | Office Building [Member] |  |
Investments in Real Estate and Real Estate Under Construction [Line Items] |  |
Square Feet (000's) | ft² | 201 |
Maximum Commitment/Estimated Completion Cost | $ 62,445 |
Lease Term (Years) | 15 years |
Investment in real estate under construction | $ 49,210 |
Charlotte, North Carolina [Member] | Office Building [Member] | LCIF [Member] |  |
Investments in Real Estate and Real Estate Under Construction [Line Items] |  |
Square Feet (000's) | ft² | 201 |
Maximum Commitment/Estimated Completion Cost | $ 62,445 |
Lease Term (Years) | 15 years |
Investment in real estate under construction | $ 49,210 |
Capitalized interest | $ 1,455 |
Opelika, Alabama [Member] | Industrial Property [Member] |  |
Investments in Real Estate and Real Estate Under Construction [Line Items] |  |
Square Feet (000's) | ft² | 165 |
Maximum Commitment/Estimated Completion Cost | $ 37,000 |
Lease Term (Years) | 25 years |
Investment in real estate under construction | $ 19,918 |

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- Definition Amount of structure or a modification to a structure under construction. Includes recently completed structures or modifications to structures that have not been placed into service. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6391035&loc=d3e2868-110229 + Details
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