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Segment Information (Schedule Of Segment Reporting By Geographic Area And Property Type) (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Segment Reporting Information [Line Items]        
Rental Revenue: Office [1] $ 707,811 $ 648,531 $ 2,101,762 $ 1,918,934
Rental Revenue: Residential [1] 9,996 6,320 26,710 15,278
Total revenue [1] $ 730,821 $ 668,515 $ 2,165,268 $ 1,971,585
Rental Revenue: % of Grand Totals 100.00% 100.00% 100.00% 100.00%
Rental Expenses $ 265,603 $ 247,989 $ 781,091 $ 726,108
Rental Expenses: Total $ 274,346 $ 256,817 $ 806,777 $ 751,750
Rental Expenses: % Of Grand Totals 100.00% 100.00% 100.00% 100.00%
Net operating Income $ 456,475 $ 411,698 $ 1,358,491 $ 1,219,835
Net operating Income: % of Grand Totals 100.00% 100.00% 100.00% 100.00%
Company's Share of Net Operating Income: % of Grand Totals 100.00% 100.00% 100.00% 100.00%
Boston [Member]        
Segment Reporting Information [Line Items]        
Rental Revenue: Office [1] $ 224,345 $ 210,277 $ 659,717 $ 623,084
Rental Revenue: Residential [1] 3,809 1,905 9,732 4,252
Total revenue [1] $ 241,168 $ 225,846 $ 706,245 $ 664,709
Rental Revenue: % of Grand Totals 33.00% 33.78% 32.62% 33.71%
Rental Expenses: Total $ 91,265 $ 88,076 $ 267,853 $ 263,581
Rental Expenses: % Of Grand Totals 33.27% 34.30% 33.20% 35.06%
Net operating Income $ 149,903 $ 137,770 $ 438,392 $ 401,128
Net operating Income: % of Grand Totals 32.84% 33.46% 32.27% 32.88%
Company's Share of Net Operating Income: % of Grand Totals 32.60% 33.29% 31.87% 33.11%
Los Angeles [Member]        
Segment Reporting Information [Line Items]        
Rental Revenue: Office [1] $ 0 $ 0 $ 0 $ 0
Rental Revenue: Residential [1] 0 0 0 0
Total revenue [1] $ 0 $ 0 $ 0 $ 0
Rental Revenue: % of Grand Totals 0.00% 0.00% 0.00% 0.00%
Rental Expenses: Total $ 0 $ 0 $ 0 $ 0
Rental Expenses: % Of Grand Totals 0.00% 0.00% 0.00% 0.00%
Net operating Income $ 0 $ 0 $ 0 $ 0
Net operating Income: % of Grand Totals 0.00% 0.00% 0.00% 0.00%
Company's Share of Net Operating Income: % of Grand Totals 3.39% 3.39% 3.55% 2.38%
New York [Member]        
Segment Reporting Information [Line Items]        
Rental Revenue: Office [1] $ 251,806 $ 237,944 $ 761,993 $ 714,348
Rental Revenue: Residential [1] 0 0 0 0
Total revenue [1] $ 251,806 $ 237,944 $ 761,993 $ 714,348
Rental Revenue: % of Grand Totals 34.45% 35.60% 35.19% 36.23%
Rental Expenses: Total $ 98,698 $ 96,795 $ 292,478 $ 282,395
Rental Expenses: % Of Grand Totals 35.97% 37.68% 36.26% 37.57%
Net operating Income $ 153,108 $ 141,149 $ 469,515 $ 431,953
Net operating Income: % of Grand Totals 33.54% 34.29% 34.56% 35.41%
Company's Share of Net Operating Income: % of Grand Totals 27.05% 27.64% 28.18% 28.85%
San Francisco [Member]        
Segment Reporting Information [Line Items]        
Rental Revenue: Office [1] $ 136,290 $ 102,035 $ 391,851 $ 285,410
Rental Revenue: Residential [1] 0 0 0 0
Total revenue [1] $ 136,290 $ 102,035 $ 391,851 $ 285,410
Rental Revenue: % of Grand Totals 18.65% 15.26% 18.10% 14.48%
Rental Expenses: Total $ 45,900 $ 34,016 $ 130,733 $ 92,858
Rental Expenses: % Of Grand Totals 16.73% 13.25% 16.20% 12.35%
Net operating Income $ 90,390 $ 68,019 $ 261,118 $ 192,552
Net operating Income: % of Grand Totals 19.80% 16.52% 19.22% 15.79%
Company's Share of Net Operating Income: % of Grand Totals 20.86% 17.39% 20.16% 16.88%
Washington, DC [Member]        
Segment Reporting Information [Line Items]        
Rental Revenue: Office [1] $ 95,370 $ 98,275 $ 288,201 $ 296,092
Rental Revenue: Residential [1] 6,187 4,415 16,978 11,026
Total revenue [1] $ 101,557 $ 102,690 $ 305,179 $ 307,118
Rental Revenue: % of Grand Totals 13.90% 15.36% 14.09% 15.58%
Rental Expenses: Total $ 38,483 $ 37,930 $ 115,713 $ 112,916
Rental Expenses: % Of Grand Totals 14.03% 14.77% 14.34% 15.02%
Net operating Income $ 63,074 $ 64,760 $ 189,466 $ 194,202
Net operating Income: % of Grand Totals 13.82% 15.73% 13.95% 15.92%
Company's Share of Net Operating Income: % of Grand Totals 16.10% 18.29% 16.24% 18.78%
Office        
Segment Reporting Information [Line Items]        
Rental Revenue: Hotel $ 2,429 $ 2,516 $ 8,227 $ 7,371
Rental Expenses 261,592 244,265 769,184 717,199
Office | Boston [Member]        
Segment Reporting Information [Line Items]        
Rental Expenses 81,278 78,089 238,438 235,560
Office | Los Angeles [Member]        
Segment Reporting Information [Line Items]        
Rental Expenses 0 0 0 0
Office | New York [Member]        
Segment Reporting Information [Line Items]        
Rental Expenses 98,698 96,795 292,478 282,395
Office | San Francisco [Member]        
Segment Reporting Information [Line Items]        
Rental Expenses 45,900 34,016 130,733 92,858
Office | Washington, DC [Member]        
Segment Reporting Information [Line Items]        
Rental Expenses 35,716 35,365 107,535 106,386
Residential Properties [Member]        
Segment Reporting Information [Line Items]        
Rental Expenses 4,011 3,724 11,907 8,909
Residential Properties [Member] | Boston [Member]        
Segment Reporting Information [Line Items]        
Rental Expenses 1,244 1,159 3,729 2,379
Residential Properties [Member] | Los Angeles [Member]        
Segment Reporting Information [Line Items]        
Rental Expenses 0 0 0 0
Residential Properties [Member] | New York [Member]        
Segment Reporting Information [Line Items]        
Rental Expenses 0 0 0 0
Residential Properties [Member] | San Francisco [Member]        
Segment Reporting Information [Line Items]        
Rental Expenses 0 0 0 0
Residential Properties [Member] | Washington, DC [Member]        
Segment Reporting Information [Line Items]        
Rental Expenses 2,767 2,565 8,178 6,530
Hotel [Member]        
Segment Reporting Information [Line Items]        
Rental Revenue: Hotel [1] 13,014 13,664 36,796 37,373
Rental Expenses: Hotel 8,743 8,828 25,686 25,642
Hotel [Member] | Boston [Member]        
Segment Reporting Information [Line Items]        
Rental Revenue: Hotel [1] 13,014 13,664 36,796 37,373
Rental Expenses: Hotel 8,743 8,828 25,686 25,642
Hotel [Member] | Los Angeles [Member]        
Segment Reporting Information [Line Items]        
Rental Revenue: Hotel [1] 0 0 0 0
Rental Expenses: Hotel 0 0 0 0
Hotel [Member] | New York [Member]        
Segment Reporting Information [Line Items]        
Rental Revenue: Hotel [1] 0 0 0 0
Rental Expenses: Hotel 0 0 0 0
Hotel [Member] | San Francisco [Member]        
Segment Reporting Information [Line Items]        
Rental Revenue: Hotel [1] 0 0 0 0
Rental Expenses: Hotel 0 0 0 0
Hotel [Member] | Washington, DC [Member]        
Segment Reporting Information [Line Items]        
Rental Revenue: Hotel [1] 0 0 0 0
Rental Expenses: Hotel 0 0 0 0
Noncontrolling interest - property partnerships [Member]        
Segment Reporting Information [Line Items]        
Net operating Income (46,249) (43,068) (138,896) (132,026)
Noncontrolling interest - property partnerships [Member] | Boston [Member]        
Segment Reporting Information [Line Items]        
Net operating Income (10,379) (8,332) (29,783) (24,879)
Noncontrolling interest - property partnerships [Member] | Los Angeles [Member]        
Segment Reporting Information [Line Items]        
Net operating Income 0 0 0 0
Noncontrolling interest - property partnerships [Member] | New York [Member]        
Segment Reporting Information [Line Items]        
Net operating Income (35,870) (34,723) (108,665) (107,420)
Noncontrolling interest - property partnerships [Member] | San Francisco [Member]        
Segment Reporting Information [Line Items]        
Net operating Income 0 (13) (448) 273
Noncontrolling interest - property partnerships [Member] | Washington, DC [Member]        
Segment Reporting Information [Line Items]        
Net operating Income 0 0 0 0
Unconsolidated Joint Ventures [Member]        
Segment Reporting Information [Line Items]        
Net operating Income 23,065 22,511 73,129 54,798
Unconsolidated Joint Ventures [Member] | Boston [Member]        
Segment Reporting Information [Line Items]        
Net operating Income 1,686 781 3,276 2,096
Unconsolidated Joint Ventures [Member] | Los Angeles [Member]        
Segment Reporting Information [Line Items]        
Net operating Income 14,702 13,246 45,864 27,222
Unconsolidated Joint Ventures [Member] | New York [Member]        
Segment Reporting Information [Line Items]        
Net operating Income (27) 1,698 3,455 5,065
Unconsolidated Joint Ventures [Member] | San Francisco [Member]        
Segment Reporting Information [Line Items]        
Net operating Income 0 0 0 0
Unconsolidated Joint Ventures [Member] | Washington, DC [Member]        
Segment Reporting Information [Line Items]        
Net operating Income 6,704 6,786 20,534 20,415
Company's Share [Member]        
Segment Reporting Information [Line Items]        
Net operating Income 433,291 391,141 1,292,724 1,142,607
Company's Share [Member] | Boston [Member]        
Segment Reporting Information [Line Items]        
Net operating Income 141,210 130,219 411,885 378,345
Company's Share [Member] | Los Angeles [Member]        
Segment Reporting Information [Line Items]        
Net operating Income 14,702 13,246 45,864 27,222
Company's Share [Member] | New York [Member]        
Segment Reporting Information [Line Items]        
Net operating Income 117,211 108,124 364,305 329,598
Company's Share [Member] | San Francisco [Member]        
Segment Reporting Information [Line Items]        
Net operating Income 90,390 68,006 260,670 192,825
Company's Share [Member] | Washington, DC [Member]        
Segment Reporting Information [Line Items]        
Net operating Income $ 69,778 $ 71,546 $ 210,000 $ 214,617
[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.