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Leases (Tables) | 3 Months Ended
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Mar. 31, 2019
Leases [Abstract] |
Finance Lease, Liability, Maturity [Table Text Block] | The following table provides a maturity analysis for the Company's lease liabilities related to its operating and finance leases as of March 31, 2019 (in thousands):
| Operating |  | Finance (1)
April 1, 2019 - December 31, 2019 | $ | 7,317 |  |  | $ | 4,401 |
2020 | 17,488 |  |  | 122,070 |
2021 | 25,403 |  |  | 2,130 |
2022 | 11,376 |  |  | 1,121 |
2023 | 9,084 |  |  | 944 |
Thereafter | 567,232 |  |  | 73,241 |
Total lease payments | 637,900 |  |  | 203,907 |
Less: interest portion | (438,247 | ) |  | (30,784 | )
Present value of lease payments | $ | 199,653 |  |  | $ | 173,123 |
The Company recorded an adjustment to the opening balance of retained earnings related to initial direct costs that, as of January 1, 2019, had not started to amortize and are no longer allowed to be capitalized in accordance with ASU 2016-02, totaling approximately to Dividends in Excess of Earnings of Boston Properties, Inc. and Partners' Capital of Boston Properties Limited Partnership, approximately $0.4 million to Noncontrolling interests - Common Units of Boston Properties, Inc. and Noncontrolling Interest - Redeemable Partnership Units of Boston Properties Limited Partnership and $70,000 to Noncontrolling Interests - Property Partnerships of Boston Properties, Inc. and Noncontrolling Interests in Property Partnerships of Boston Properties Limited Partnership on the corresponding Consolidated Balance Sheets. $3.9 million to Dividends in Excess of Earnings of Boston Properties, Inc. and Partners' Capital of Boston Properties Limited Partnership, approximately $0.4 million
52 |  | P52Y0M0D
5 |  | P5Y0M0D
Lease, Cost [Table Text Block] | The following tables provide quantitative information for the Company's operating and finance leases as of March 31, 2019 (dollars in thousands):
| Three months ended March 31, 2019
Lease costs |
Operating lease costs | $ | 3,677 |
Finance lease costs |
Amortization of right of use asset (1) | $ | 16 |
Interest on lease liabilities (2) | $ | 12 |
| March 31, 2019
Other information |
Weighted-average remaining lease term (in years) |
Operating leases | 52 |
Finance leases | 5 |
Weighted-average discount rate |
Operating leases | 5.7 | %
Finance leases | 4.1 | %
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(1) | The finance leases relate to either land, building or assets that remain in development. The Company's policy is not to depreciate finance lease assets related to land because it is assumed to have an indefinite life. For assets under development, depreciation may commence once the asset is placed in-service and depreciation would be recognized in accordance with the Company's policy.
(2) | Three of the finance leases relate to assets under development and as such the entire interest amount was capitalized.
Operating Lease, Lease Income [Table Text Block] | The following table summarizes the components of lease revenue recognized during the three months ended March 31, 2019 included within the Company's Consolidated Statements of Operations (in thousands):
Lease Revenue | Three months ended March 31, 2019
Fixed Contractual Payments | $ | 553,986 |
Variable lease payments | 125,265 |
| $ | 679,251 |
Schedule of Future Minimum Rental Payments for Operating Leases [Table Text Block] | The following table provides a maturity analysis for the Company's future contractual minimum lease payments to be made by the Company as of December 31, 2018, under non-cancelable ground leases which expire on various dates through 2114:
Years Ending December 31, | (in thousands)
2019 | $ | 11,425 |
2020 | 18,425 |
2021 | 25,310 |
2022 | 8,894 |
2023 | 9,084 |
Thereafter | 567,232 |
Capital Leases in Financial Statements of Lessee Disclosure [Text Block] | The following table provides a maturity analysis for the Company's future minimum lease payments, as of December 31, 2018, related to the four capital leases, through 2036:
Years Ending December 31, | (in thousands)
2019 | $ | 1,441 |
2020 | 12,682 |
2021 | 2,123 |
2022 | 1,253 |
2023 | 944 |
Thereafter | 73,241 |
Total expected minimum lease payments | 91,684 |
Interest portion | (27,497 | )
Present value of expected net minimum lease payments | $ | 64,187 |
Lessor, Operating Lease, Payments to be Received, Maturity [Table Text Block] | The future contractual minimum lease payments to be received (excluding operating expense reimbursements) by the Company as of December 31, 2018, under non-cancelable operating leases which expire on various dates through 2049:
Years Ending December 31, | (in thousands)
2019 | $ | 2,088,171 |
2020 | 2,106,963 |
2021 | 2,015,031 |
2022 | 1,838,699 |
2023 | 1,736,636 |
Thereafter | 12,295,464 |
The future contractual lease payments to be received (excluding operating expense reimbursements) by the Company as of March 31, 2019, under non-cancelable operating leases which expire on various dates through 2049:
| (in thousands)
April 1, 2019 - December 31, 2019 | $ | 1,573,871 |
2020 | 2,147,464 |
2021 | 2,076,969 |
2022 | 1,910,362 |
2023 | 1,811,936 |
Thereafter | 12,821,229 |
Lessee, Operating Lease, Liability, Maturity [Table Text Block] | The following table provides a maturity analysis for the Company's lease liabilities related to its operating and finance leases as of March 31, 2019 (in thousands):
| Operating |  | Finance (1)
April 1, 2019 - December 31, 2019 | $ | 7,317 |  |  | $ | 4,401 |
2020 | 17,488 |  |  | 122,070 |
2021 | 25,403 |  |  | 2,130 |
2022 | 11,376 |  |  | 1,121 |
2023 | 9,084 |  |  | 944 |
Thereafter | 567,232 |  |  | 73,241 |
Total lease payments | 637,900 |  |  | 203,907 |
Less: interest portion | (438,247 | ) |  | (30,784 | )
Present value of lease payments | $ | 199,653 |  |  | $ | 173,123 |
_______________
(1) | Finance lease payments in 2020 and 2024 include approximately $119.8 million and $38.7 million, respectively, related to purchase options that the Company is reasonably certain that it will exercise.

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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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 30 -URI http://asc.fasb.org/subtopic&trid=2209026 + Details
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- Definition Tabular disclosure of undiscounted cash flows of finance lease liability. Includes, but is not limited to, reconciliation of undiscounted cash flows to finance lease liability recognized in statement of financial position. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=77888426&loc=SL77918701-209980 + Details
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- Definition Tabular disclosure of lessee's lease cost. Includes, but is not limited to, interest expense for finance lease, amortization of right-of-use asset for finance lease, operating lease cost, short-term lease cost, variable lease cost and sublease income. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=77888426&loc=SL77918686-209980 + Details
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- Definition Tabular disclosure of undiscounted cash flows of lessee's operating lease liability. Includes, but is not limited to, reconciliation of undiscounted cash flows to operating lease liability recognized in statement of financial position. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=77888426&loc=SL77918701-209980 + Details
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- Definition Tabular disclosure of maturity of undiscounted cash flows to be received by lessor on annual basis for operating lease. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 30 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=77888428&loc=SL77919396-209981 + Details
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- Definition Tabular disclosure of future minimum payments required in the aggregate and for each of the five succeeding fiscal years for operating leases having initial or remaining noncancelable lease terms in excess of one year and the total minimum rentals to be received in the future under noncancelable subleases as of the balance sheet date. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 20 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=77902758&loc=d3e41502-112717 + Details
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