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Basis Of Presentation And Summary Of Significant Accounting Policies (Narrative) (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Entity Information [Line Items]        
Payroll and related costs from management services contracts $ 2,516 $ 0 $ 7,371 $ 0
Direct reimbursements of payroll and related costs from management services contracts 2,516 0 7,371 0
Net Cash Provided by (Used in) Operating Activities     770,627 584,965
Cumulative effect of a change in accounting principle     5,496 (2,035)
Net Cash Provided by (Used in) Investing Activities     1,020,067 593,895
Net Cash Provided by (Used in) Financing Activities     167,855 165,676
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents, Period Increase (Decrease), Including Exchange Rate Effect     (81,585) 156,746
Interest Expense 95,366 92,032 277,790 282,709
Boston Properties Limited Partnership        
Entity Information [Line Items]        
Payroll and related costs from management services contracts 2,516 0 7,371 0
Direct reimbursements of payroll and related costs from management services contracts 2,516 0 7,371 0
Net Cash Provided by (Used in) Operating Activities     770,627 584,965
Cumulative effect of a change in accounting principle     4,933 (272)
Net Cash Provided by (Used in) Investing Activities     1,020,067 593,895
Net Cash Provided by (Used in) Financing Activities     167,855 165,676
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents, Period Increase (Decrease), Including Exchange Rate Effect     (81,585) 156,746
Interest Expense 95,366 $ 92,032 277,790 282,709
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 2,500   7,400  
Direct reimbursements of payroll and related costs from management services contracts 2,500   7,400  
Cumulative effect of a change in accounting principle     4,900  
Accounting Standards Update 2014-09 [Member] | Boston Properties Limited Partnership        
Entity Information [Line Items]        
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 2014-09 [Member] | Noncontrolling Interests [Member] | Boston Properties Limited Partnership        
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       (7,700)
Net Cash Provided by (Used in) Investing Activities       28,500
Net Cash Provided by (Used in) Financing Activities       (200)
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents, Period Increase (Decrease), Including Exchange Rate Effect       $ (20,600)
Accounting Standards Update 2017-12 [Member]        
Entity Information [Line Items]        
Interest Expense $ 1,700