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Basis Of Presentation And Summary Of Significant Accounting Policies (Narrative) (Details) $ in Thousands | 9 Months Ended
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Sep. 30, 2017 USD ($)
Entity Information [Line Items] |
Cumulative effect of a change in accounting principle | $ 2,035
Boston Properties Limited Partnership |
Entity Information [Line Items] |
Cumulative effect of a change in accounting principle | 272
Dividends In Excess Of Earnings [Member] |
Entity Information [Line Items] |
Cumulative effect of a change in accounting principle | 272
Noncontrolling Interests [Member] |
Entity Information [Line Items] |
Cumulative effect of a change in accounting principle | 1,763
Noncontrolling Interests [Member] | Boston Properties Limited Partnership |
Entity Information [Line Items] |
Cumulative effect of a change in accounting principle | $ 1,763

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- Definition Amount of the cumulative effect on retained earnings net of related income tax effect. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 250 -SubTopic 10 -Section 50 -Paragraph 9 -URI http://asc.fasb.org/extlink&oid=64853466&loc=d3e22663-107794 + Details
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