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Noncontrolling Interests Redeemable common units of Boston Properties Limited Partnership (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Stockholders' Equity Attributable to Noncontrolling Interest [Roll Forward] |  |  |
Conversion of redeemable partnership units | $ 0 | $ 0 | $ 0
Cumulative effect of a change in accounting principle | 5,496 | (2,035) |
Boston Properties Limited Partnership |  |  |
Stockholders' Equity Attributable to Noncontrolling Interest [Roll Forward] |  |  |
Cumulative effect of a change in accounting principle | 4,933 | (272) |
Noncontrolling Interest [Member] |  |  |
Stockholders' Equity Attributable to Noncontrolling Interest [Roll Forward] |  |  |
Conversion of redeemable partnership units | (24,311) | (22,879) | (15,374)
Cumulative effect of a change in accounting principle | 563 | (1,763) |
Noncontrolling Interest [Member] | Boston Properties Limited Partnership |  |  |
Stockholders' Equity Attributable to Noncontrolling Interest [Roll Forward] |  |  |
Beginning Balance | 2,292,263 | 2,262,040 | 2,286,689
Contributions | 34,680 | 31,743 | 31,395
Net income | (66,807) | 52,210 | 59,260
Distributions | (62,731) | (54,494) | (49,087)
Conversion of redeemable partnership units | (2,880) | (16,916) | (6,461)
Unearned compensation | 2,181 | 1,650 | (3,464)
Cumulative effect of a change in accounting principle | 563 | (1,763) |
Other Comprehensive Income (Loss) | 304 | 206 | (4,379)
Adjustment to reflect redeemable partnership units at redemption value | (330,596) | 17,587 | (51,913)
Ending Balance | $ 2,000,591 | $ 2,292,263 | $ 2,262,040

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