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Segment Information (Schedule Of Segment Reporting By Geographic Area And Property Type) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Segment Reporting Information [Line Items]      
Rental Revenue: Class A Office [1] $ 2,824,634 $ 2,590,659 $ 2,505,272
Rental Revenue: Residential [1] 36,914 22,551 16,596
Rental Revenue Total [1] $ 2,910,137 $ 2,662,328 $ 2,567,471
Rental Revenue: % of Grand Totals [1] 100.00% 100.00% 100.00%
Rental Expenses: Class A Office $ 1,034,025 $ 966,547 $ 923,675
Rental Expenses: Residential 15,985 12,604 6,302
Rental Expenses: Total $ 1,084,014 $ 1,013,014 $ 962,036
Rental Expenses: % Of Grand Totals 100.00% 100.00% 100.00%
Net Operating Income: % of Grand Totals 100.00% 100.00% 100.00%
Net Operating Income $ 1,826,123 $ 1,649,314 $ 1,605,435
Company's Share of Net Operating Income: % of Grand Totals 100.00% 100.00% 100.00%
Boston [Member]      
Segment Reporting Information [Line Items]      
Rental Revenue: Class A Office [1] $ 895,098 $ 838,341 $ 776,279
Rental Revenue: Residential [1] 13,786 6,694 4,745
Rental Revenue Total [1] $ 957,473 $ 894,153 $ 826,627
Rental Revenue: % of Grand Totals [1] 32.90% 33.59% 32.20%
Rental Expenses: Class A Office $ 322,282 $ 315,653 $ 301,097
Rental Expenses: Residential 5,071 3,632 2,044
Rental Expenses: Total $ 361,357 $ 353,148 $ 335,200
Rental Expenses: % Of Grand Totals 33.34% 34.86% 34.84%
Net Operating Income: % of Grand Totals 32.64% 32.80% 30.61%
Net Operating Income $ 596,116 $ 541,005 $ 491,427
Company's Share of Net Operating Income: % of Grand Totals 32.27% 32.86% 30.87%
Los Angeles [Member]      
Segment Reporting Information [Line Items]      
Rental Revenue: Class A Office [1] $ 0 $ 0 $ 0
Rental Revenue: Residential [1] 0 0 0
Rental Revenue Total [1] $ 0 $ 0 $ 0
Rental Revenue: % of Grand Totals [1] 0.00% 0.00% 0.00%
Rental Expenses: Class A Office $ 0 $ 0 $ 0
Rental Expenses: Residential 0 0 0
Rental Expenses: Total $ 0 $ 0 $ 0
Rental Expenses: % Of Grand Totals 0.00% 0.00% 0.00%
Net Operating Income: % of Grand Totals 0.00% 0.00% 0.00%
Net Operating Income $ 0 $ 0 $ 0
Company's Share of Net Operating Income: % of Grand Totals 3.53% 2.75% 1.79%
New York [Member]      
Segment Reporting Information [Line Items]      
Rental Revenue: Class A Office [1] $ 1,011,912 $ 959,050 $ 969,371
Rental Revenue: Residential [1] 0 0 0
Rental Revenue Total [1] $ 1,011,912 $ 959,050 $ 969,371
Rental Revenue: % of Grand Totals [1] 34.78% 36.02% 37.75%
Rental Expenses: Class A Office $ 389,532 $ 377,992 $ 372,810
Rental Expenses: Residential 0 0 0
Rental Expenses: Total $ 389,532 $ 377,992 $ 372,810
Rental Expenses: % Of Grand Totals 35.93% 37.32% 38.76%
Net Operating Income: % of Grand Totals 34.09% 35.23% 37.15%
Net Operating Income $ 622,380 $ 581,058 $ 596,561
Company's Share of Net Operating Income: % of Grand Totals 27.77% 28.63% 30.94%
San Francisco [Member]      
Segment Reporting Information [Line Items]      
Rental Revenue: Class A Office [1] $ 533,189 $ 397,180 $ 345,519
Rental Revenue: Residential [1] 0 0 0
Rental Revenue Total [1] $ 533,189 $ 397,180 $ 345,519
Rental Revenue: % of Grand Totals [1] 18.32% 14.92% 13.46%
Rental Expenses: Class A Office $ 177,994 $ 130,016 $ 105,253
Rental Expenses: Residential 0 0 0
Rental Expenses: Total $ 177,994 $ 130,016 $ 105,253
Rental Expenses: % Of Grand Totals 16.42% 12.83% 10.94%
Net Operating Income: % of Grand Totals 19.45% 16.20% 14.97%
Net Operating Income $ 355,195 $ 267,164 $ 240,266
Company's Share of Net Operating Income: % of Grand Totals 20.39% 17.22% 16.10%
Washington, DC [Member]      
Segment Reporting Information [Line Items]      
Rental Revenue: Class A Office [1] $ 384,435 $ 396,088 $ 414,103
Rental Revenue: Residential [1] 23,128 15,857 11,851
Rental Revenue Total [1] $ 407,563 $ 411,945 $ 425,954
Rental Revenue: % of Grand Totals [1] 14.00% 15.47% 16.59%
Rental Expenses: Class A Office $ 144,217 $ 142,886 $ 144,515
Rental Expenses: Residential 10,914 8,972 4,258
Rental Expenses: Total $ 155,131 $ 151,858 $ 148,773
Rental Expenses: % Of Grand Totals 14.31% 14.99% 15.46%
Net Operating Income: % of Grand Totals 13.82% 15.77% 17.27%
Net Operating Income $ 252,432 $ 260,087 $ 277,181
Company's Share of Net Operating Income: % of Grand Totals 16.04% 18.54% 20.30%
Hotel [Member]      
Segment Reporting Information [Line Items]      
Other revenue [1] $ 48,589 $ 49,118 $ 45,603
Payroll and related costs from management services contracts 34,004 33,863 32,059
Hotel [Member] | Boston [Member]      
Segment Reporting Information [Line Items]      
Other revenue [1] 48,589 49,118 45,603
Payroll and related costs from management services contracts 34,004 33,863 32,059
Hotel [Member] | Los Angeles [Member]      
Segment Reporting Information [Line Items]      
Other revenue [1] 0 0 0
Payroll and related costs from management services contracts 0 0 0
Hotel [Member] | New York [Member]      
Segment Reporting Information [Line Items]      
Other revenue [1] 0 0 0
Payroll and related costs from management services contracts 0 0 0
Hotel [Member] | San Francisco [Member]      
Segment Reporting Information [Line Items]      
Other revenue [1] 0 0 0
Payroll and related costs from management services contracts 0 0 0
Hotel [Member] | Washington, DC [Member]      
Segment Reporting Information [Line Items]      
Other revenue [1] 0 0 0
Payroll and related costs from management services contracts 0 0 0
Noncontrolling interest - property partnerships [Member]      
Segment Reporting Information [Line Items]      
Net Operating Income (183,989) (177,365) (174,245)
Noncontrolling interest - property partnerships [Member] | Boston [Member]      
Segment Reporting Information [Line Items]      
Net Operating Income (40,109) (33,862) (31,857)
Noncontrolling interest - property partnerships [Member] | Los Angeles [Member]      
Segment Reporting Information [Line Items]      
Net Operating Income 0 0 0
Noncontrolling interest - property partnerships [Member] | New York [Member]      
Segment Reporting Information [Line Items]      
Net Operating Income (143,432) (143,562) (142,916)
Noncontrolling interest - property partnerships [Member] | San Francisco [Member]      
Segment Reporting Information [Line Items]      
Net Operating Income (448) 59 528
Noncontrolling interest - property partnerships [Member] | Washington, DC [Member]      
Segment Reporting Information [Line Items]      
Net Operating Income 0 0 0
Unconsolidated Joint Ventures [Member]      
Segment Reporting Information [Line Items]      
Net Operating Income 97,716 79,893 64,008
Unconsolidated Joint Ventures [Member] | Boston [Member]      
Segment Reporting Information [Line Items]      
Net Operating Income 5,494 2,866 1,962
Unconsolidated Joint Ventures [Member] | Los Angeles [Member]      
Segment Reporting Information [Line Items]      
Net Operating Income 61,338 42,750 26,816
Unconsolidated Joint Ventures [Member] | New York [Member]      
Segment Reporting Information [Line Items]      
Net Operating Income 4,174 6,590 8,832
Unconsolidated Joint Ventures [Member] | San Francisco [Member]      
Segment Reporting Information [Line Items]      
Net Operating Income 0 0 0
Unconsolidated Joint Ventures [Member] | Washington, DC [Member]      
Segment Reporting Information [Line Items]      
Net Operating Income 26,710 27,687 26,398
Company's Share [Member]      
Segment Reporting Information [Line Items]      
Net Operating Income 1,739,850 1,551,842 1,495,198
Company's Share [Member] | Boston [Member]      
Segment Reporting Information [Line Items]      
Net Operating Income 561,501 510,009 461,532
Company's Share [Member] | Los Angeles [Member]      
Segment Reporting Information [Line Items]      
Net Operating Income 61,338 42,750 26,816
Company's Share [Member] | New York [Member]      
Segment Reporting Information [Line Items]      
Net Operating Income 483,122 444,086 462,477
Company's Share [Member] | San Francisco [Member]      
Segment Reporting Information [Line Items]      
Net Operating Income 354,747 267,223 240,794
Company's Share [Member] | Washington, DC [Member]      
Segment Reporting Information [Line Items]      
Net Operating Income $ 279,142 $ 287,774 $ 303,579
[1]
Rental Revenue is equal to Total Revenue per the Company’s Consolidated Statements of Operations, less Development and Management Services Revenue and Direct Reimbursements of Payroll and Related Costs from Management Services Contracts Revenue per the Consolidated Statements of Operations.