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Real Estate Investments - Continuing Operations (Details) - USD ($) $ in Thousands | Dec. 31, 2015 | Dec. 31, 2014
--- | --- | ---
Real Estate Properties [Line Items] |  |
Real estate investment property, at cost | $ 2,637,797 | $ 2,470,953
Properties under development or held for future development | 36,094 | 76,235
Office [Member] |  |
Real Estate Properties [Line Items] |  |
Real estate investment property, at cost | 1,554,334 | 1,502,052
Properties under development or held for future development | 18,711 | 36,379
Retail [Member] |  |
Real Estate Properties [Line Items] |  |
Real estate investment property, at cost | 442,039 | 463,716
Properties under development or held for future development | 1,076 | 500
Multifamily [Member] |  |
Real Estate Properties [Line Items] |  |
Real estate investment property, at cost | 641,424 | 505,185
Properties under development or held for future development | 16,307 | 39,356
7900 Westpark Drive [Member] |  |
Real Estate Properties [Line Items] |  |
Real estate investment property, at cost | 25,900 |
Properties under development or held for future development | 10,200 |
Six Fifty North Glebe Road [Member] |  |
Real Estate Properties [Line Items] |  |
Real estate investment property, at cost | 19,200 | 31,300
Properties under development or held for future development | 1,188 | 0
Variable Interest Entity, Consolidated, Carrying Amount, Assets | $ 0 | $ 17,947

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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 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Phase -URI http://asc.fasb.org/extlink&oid=49177889 + Details
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- Definition Amount of real estate investment property which may include the following: (1) land available-for-sale; (2) land available-for-development; (3) investments in building and building improvements; (4) tenant allowances; (5) developments in-process; (6) rental properties; and (7) other real estate investments. + 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 210.7-03.1(d)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 + Details
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