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Basis Of Presentation And Summary Of Significant Accounting Policies (Narrative) (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Entity Information [Line Items]    
Payroll and related costs from management services contracts $ 2,885 $ 0
Direct reimbursements of payroll and related costs from management services contracts 2,885 0
Net Cash Provided by (Used in) Operating Activities (225,778) (239,852)
Cumulative effect of a change in accounting principle (5,496) 2,035
Net Cash Provided by (Used in) Investing Activities 183,788 267,823
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents, Period Increase (Decrease), Including Exchange Rate Effect 50,240 65,905
Interest Expense 90,220 95,534
Boston Properties Limited Partnership    
Entity Information [Line Items]    
Payroll and related costs from management services contracts 2,885 0
Direct reimbursements of payroll and related costs from management services contracts 2,885 0
Net Cash Provided by (Used in) Operating Activities (225,778) (239,852)
Cumulative effect of a change in accounting principle (4,933) 272
Net Cash Provided by (Used in) Investing Activities 183,788 267,823
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents, Period Increase (Decrease), Including Exchange Rate Effect 50,240 65,905
Interest Expense 90,220 95,534
Dividends In Excess Of Earnings [Member]    
Entity Information [Line Items]    
Cumulative effect of a change in accounting principle (4,933) 272
Noncontrolling Interests [Member]    
Entity Information [Line Items]    
Cumulative effect of a change in accounting principle (563) 1,763
Noncontrolling Interests [Member] | Boston Properties Limited Partnership    
Entity Information [Line Items]    
Cumulative effect of a change in accounting principle (563) 1,763
Accounting Standards Update 2014-09 [Member]    
Entity Information [Line Items]    
Payroll and related costs from management services contracts 2,900  
Direct reimbursements of payroll and related costs from management services contracts 2,900  
Cumulative effect of a change in accounting principle (4,900)  
Accounting Standards Update 2014-09 [Member] | Noncontrolling Interests [Member]    
Entity Information [Line Items]    
Cumulative effect of a change in accounting principle (600)  
Accounting Standards Update 2016-18 [Member]    
Entity Information [Line Items]    
Net Cash Provided by (Used in) Operating Activities   6,700
Net Cash Provided by (Used in) Investing Activities   5,200
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents, Period Increase (Decrease), Including Exchange Rate Effect   $ 11,900
Accounting Standards Update 2017-12 [Member]    
Entity Information [Line Items]    
Interest Expense $ 1,700