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Earnings Per Share / Common Unit (Tables)

12 Months Ended

Dec. 31, 2020

Entity Information [Line Items]

Computation Of Basic And Diluted Earnings Per Share / Unit

			Year ended December 31, 2020
			Income (Numerator)						Shares (Denominator)						Per Share Amount
			(in thousands, except for per share amounts)
Basic Earnings:
Net income attributable to Boston Properties, Inc. common shareholders			$	862,227					155,432						$	5.55
Allocation of undistributed earnings to participating securities			(748)						—						(0.01)
Net income attributable to Boston Properties, Inc. common shareholders			$	861,479					155,432						$	5.54
Effect of Dilutive Securities:
Stock Based Compensation			—						85						—
Diluted Earnings:
Net income attributable to Boston Properties, Inc. common shareholders			$	861,479					155,517						$	5.54
			Year ended December 31, 2019
			Income (Numerator)						Shares (Denominator)						Per Share Amount
			(in thousands, except for per share amounts)
Basic Earnings:
Net income attributable to Boston Properties, Inc. common shareholders			$	511,034					154,582						$	3.31
Effect of Dilutive Securities:
Stock Based Compensation			—						301						(0.01)
Diluted Earnings:
Net income attributable to Boston Properties, Inc. common shareholders			$	511,034					154,883						$	3.30
			Year ended December 31, 2018
			Income (Numerator)						Shares (Denominator)						Per Share Amount
			(in thousands, except for per share amounts)
Basic Earnings:
Net income attributable to Boston Properties, Inc. common shareholders			$	572,347					154,427						$	3.71
Allocation of undistributed earnings to participating securities			(101)						—						—
Net income attributable to Boston Properties, Inc. common shareholders			$	572,246					154,427						$	3.71
Effect of Dilutive Securities:
Stock Based Compensation			—						255						(0.01)
Diluted Earnings:
Net income attributable to Boston Properties, Inc. common shareholders			$	572,246					154,682						$	3.70

Boston Properties Limited Partnership

Entity Information [Line Items]

Computation Of Basic And Diluted Earnings Per Share / Unit

Included in the number of units (the denominator) below are approximately 17,211,000 and 17,618,000 and 17,485,000 redeemable common units for the years ended December 31, 2020, 2019 and 2018, respectively.

			Year ended December 31, 2020
			Income (Numerator)						Units (Denominator)						Per Unit Amount
			(in thousands, except for per unit amounts)
Basic Earnings:
Net income attributable to Boston Properties Limited Partnership common unitholders			$	979,979					172,643						$	5.68
Allocation of undistributed earnings to participating securities			(830)						—						(0.01)
Net income attributable to Boston Properties Limited Partnership common unitholders			$	979,149					172,643						$	5.67
Effect of Dilutive Securities:
Stock Based Compensation			—						85						—
Diluted Earnings:
Net income attributable to Boston Properties Limited Partnership common unitholders			$	979,149					172,728						$	5.67
			Year ended December 31, 2019
			Income (Numerator)						Units (Denominator)						Per Unit Amount
			(in thousands, except for per unit amounts)
Basic Earnings:
Net income attributable to Boston Properties Limited Partnership common unitholders			$	580,102					172,200						$	3.37
Effect of Dilutive Securities:
Stock Based Compensation			—						301						(0.01)
Diluted Earnings:
Net income attributable to Boston Properties Limited Partnership common unitholders			$	580,102					172,501						$	3.36

			Year ended December 31, 2018
			Income (Numerator)						Units (Denominator)						Per Unit Amount
			(in thousands, except for per unit amounts)
Basic Earnings:
Net income attributable to Boston Properties Limited Partnership common unitholders			$	656,903					171,912						$	3.82
Allocation of undistributed earnings to participating securities			(113)						—						—
Net income attributable to Boston Properties Limited Partnership common unitholders			$	656,790					171,912						$	3.82
Effect of Dilutive Securities:
Stock Based Compensation			—						255						(0.01)
Diluted Earnings:
Net income attributable to Boston Properties Limited Partnership common unitholders			$	656,790					172,167						$	3.81

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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- Definition

Tabular disclosure of an entity's basic and diluted earnings per share calculations, including a reconciliation of numerators and denominators of the basic and diluted per-share computations for income from continuing operations.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 260
-SubTopic 10
-Section 50
-Paragraph 1
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257

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