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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

X

- 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

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X

- 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

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

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X

- Definition

The carrying amount of the consolidated Variable Interest Entity's assets included in the reporting entity's statement of financial position.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 810
-SubTopic 10
-Section 50
-Paragraph 3
-Subparagraph (bb)
-URI http://asc.fasb.org/extlink&oid=52262685&loc=d3e5710-111685

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