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Summary Of Significant Accounting Policies (Tables) | 12 Months Ended
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Dec. 31, 2017
Summary Of Significant Accounting Policies [Line Items] |
Property, Plant and Equipment [Table Text Block] | Depreciation is computed on a straight-line basis over the estimated useful lives of the assets as follows:
Land improvements |  | 25 to 40 years
Buildings and improvements |  | 10 to 40 years
Tenant improvements |  | Shorter of useful life or terms of related lease
Furniture, fixtures, and equipment |  | 3 to 7 years
Schedule of Finite-Lived Intangible Assets, Future Amortization Expense [Table Text Block] | The following table summarizes the scheduled amortization of the Company’s acquired “above-” and “below-market” lease intangibles for each of the five succeeding years (in thousands).
|  | Acquired Above-Market Lease Intangibles |  | Acquired Below-Market Lease Intangibles
2018 |  | $ | 8,614 |  |  | $ | 32,152 |
2019 |  | 7,106 |  |  | 27,281 |
2020 |  | 5,394 |  |  | 10,736 |
2021 |  | 2,988 |  |  | 6,399 |
2022 |  | 315 |  |  | 5,669 |
The following table summarizes the scheduled amortization of the Company’s acquired in-place lease intangibles for each of the five succeeding years (in thousands).
| Acquired In-Place Lease Intangibles
2018 | $ | 33,651 |
2019 | 27,333 |
2020 | 14,464 |
2021 | 8,777 |
2022 | 4,758 |
Schedule Of Future Contractual Minimum Lease Payments Under Non-Cancelable Ground Leases [Table Text Block] | The future contractual minimum lease payments to be made by the Company as of December 31, 2017, under non-cancelable ground leases which expire on various dates through 2114, are as follows:
Years Ending December 31, | (in thousands)
2018 | $ | 11,349 |
2019 | 16,360 |
2020 | 25,552 |
2021 | 11,814 |
2022 | 8,894 |
Thereafter | 576,315 |
Capital Leases in Financial Statements of Lessee Disclosure [Text Block] | The following reflects the gross amount of assets recorded under capital leases by asset class at December 31, 2017 and December 31, 2016 (in thousands):
|  | December 31,
|  | 2017 |  | 2016
Buildings and improvements |  | $ | 23,636 |  |  | $ | 23,636 |
Construction in progress |  | 28,962 |  |  | — |
Total |  | $ | 52,598 |  |  | $ | 23,636 |
The future minimum lease payments, as of December 31, 2017, related to the three capital leases, through 2036 are as follows:
Years Ending December 31, | (in thousands)
2018 | $ | 913 |
2019 | 1,392 |
2020 | 2,097 |
2021 | 1,375 |
2022 | 930 |
Thereafter | 74,185 |
Total expected minimum lease payments | 80,892 |
Interest portion | (29,296 | )
Present value of expected net minimum lease payments | $ | 51,596 |
Fair Value, by Balance Sheet Grouping [Table Text Block] | The following table presents the aggregate carrying value of the Company’s mortgage notes payable, net, mezzanine notes payable, unsecured senior notes, net and unsecured line of credit and the Company’s corresponding estimate of fair value as of December 31, 2017 and December 31, 2016 (in thousands):
| December 31, 2017 |  | December 31, 2016
| Carrying Amount |  | Estimated Fair Value |  | Carrying Amount |  | Estimated Fair Value
Mortgage notes payable, net | $ | 2,979,281 |  |  | $ | 3,042,920 |  |  | $ | 2,063,087 |  |  | $ | 2,092,237 |
Mezzanine notes payable | — |  |  | — |  |  | 307,093 |  |  | 308,344 |
Unsecured senior notes, net | 7,247,330 |  |  | 7,461,615 |  |  | 7,245,953 |  |  | 7,428,077 |
Unsecured line of credit | 45,000 |  |  | 45,000 |  |  | — |  |  | — |
Total | $ | 10,271,611 |  |  | $ | 10,549,535 |  |  | $ | 9,616,133 |  |  | $ | 9,828,658 |
Tax Treatment Of Common Dividends Per Share For Federal Tax Purposes, Table [Table Text Block] | The tax treatment of common dividends per share for federal income tax purposes is as follows:
|  | For the year ended December 31,
|  | 2017 |  | 2016 |  | 2015
|  | Per Share |  | % |  | Per Share |  | % |  | Per Share |  | %
Ordinary income |  | $ | 2.86 |  |  | 98.29 | % |  | $ | 2.76 |  |  | 90.51 | % |  | $ | 2.34 |  |  | 57.97 | %
Capital gain income |  | 0.05 |  |  | 1.71 | % |  | 0.29 |  |  | 9.49 | % |  | 1.70 |  |  | 42.03 | %
Total |  | $ | 2.91 |  | (1) | 100.00 | % |  | $ | 3.05 |  | (2) | 100.00 | % |  | $ | 4.04 |  | (3) | 100.00 | %
_____________
(1) | The fourth quarter 2017 regular quarterly dividend was $0.80 per common share of which approximately $0.47 per common share was allocable to 2017 and approximately $0.33 per common share is allocable to 2018.
(2) | The fourth quarter 2016 regular quarterly dividend was $0.75 per common share of which approximately $0.56 per common share was allocable to 2016 and approximately $0.19 per common share is allocable to 2017.
(3) | The fourth quarter 2015 dividend of $1.90 per common share consists of a $1.25 per common share special dividend and a $0.65 per common share regular quarterly dividend. Approximately $1.35 per common share was allocable to 2015 and approximately $0.55 per common share is allocable to 2016.
Gaap Reconciliation Of Net Income To Taxable Income, Table [Table Text Block] | The following table reconciles GAAP net income attributable to Boston Properties, Inc. to taxable income (unaudited):
|  | For the year ended December 31,
|  | 2017 |  | 2016 |  | 2015
|  | (in thousands)
Net income attributable to Boston Properties, Inc. |  | $ | 462,439 |  |  | $ | 512,785 |  |  | $ | 583,106 |
Straight-line rent and net “above-” and “below-market” rent adjustments |  | (77,801 | ) |  | (65,861 | ) |  | (92,483 | )
Book/Tax differences from depreciation and amortization |  | 142,234 |  |  | 235,819 |  |  | 307,115 |
Book/Tax differences from interest expense |  | (18,136 | ) |  | (36,223 | ) |  | (43,349 | )
Book/Tax differences on gains/(losses) from capital transactions |  | 1,123 |  |  | (70,880 | ) |  | (74,482 | )
Book/Tax differences from stock-based compensation |  | 37,990 |  |  | 33,463 |  |  | 22,008 |
Tangible Property Regulations |  | (116,265 | ) |  | (104,783 | ) |  | (74,887 | )
Other book/tax differences, net |  | 33,411 |  |  | (6,121 | ) |  | (15,259 | )
Taxable income |  | $ | 464,995 |  |  | $ | 498,199 |  |  | $ | 611,769 |
Boston Properties Limited Partnership |
Summary Of Significant Accounting Policies [Line Items] |
Gaap Reconciliation Of Net Income To Taxable Income, Table [Table Text Block] | The following table reconciles GAAP net income attributable to Boston Properties Limited Partnership to taxable income (unaudited):
|  | For the year ended December 31,
|  | 2017 |  | 2016 |  | 2015
|  | (in thousands)
Net income attributable to Boston Properties Limited Partnership |  | $ | 523,366 |  |  | $ | 585,841 |  |  | $ | 659,248 |
Straight-line rent and net “above-” and “below-market” rent adjustments |  | (86,773 | ) |  | (73,604 | ) |  | (103,227 | )
Book/Tax differences from depreciation and amortization |  | 144,436 |  |  | 245,239 |  |  | 329,629 |
Book/Tax differences from interest expense |  | (20,227 | ) |  | (40,481 | ) |  | (48,385 | )
Book/Tax differences on gains/(losses) from capital transactions |  | 784 |  |  | (69,683 | ) |  | (67,602 | )
Book/Tax differences from stock-based compensation |  | 42,371 |  |  | 37,397 |  |  | 24,565 |
Tangible Property Regulations |  | (129,673 | ) |  | (117,102 | ) |  | (83,587 | )
Other book/tax differences, net |  | 37,607 |  |  | (3,387 | ) |  | (14,561 | )
Taxable income |  | $ | 511,891 |  |  | $ | 564,220 |  |  | $ | 696,080 |

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- Definition The entire disclosure for capital leasing arrangements including, but not limited to, the following: a) the basis on which contingent rental payments are determined; (b) the existence and terms of renewal or purchase options and escalation clauses; (c) restrictions imposed by lease agreements, such as those concerning dividends, additional debt, and further leasing. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 30 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6455398&loc=d3e45280-112737 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6452660&loc=d3e36991-112694 + Details
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