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Stockholders' Equity / Partners' Capital Partners' Capital Change in Series B Preferred Units (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Entity Information [Line Items] |  |  |
Beginning Balance | $ 200,000 |  |
Ending Balance | 200,000 | $ 200,000 |
Boston Properties Limited Partnership |  |  |
Entity Information [Line Items] |  |  |
Beginning Balance | 193,623 | 193,623 | $ 193,623
Net Income | 10,500 | 10,500 | 10,500
Distributions | (10,500) | (10,500) | (10,500)
Ending Balance | $ 193,623 | $ 193,623 | $ 193,623

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