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Segment Information (Schedule Of Segment Reporting By Geographic Area And Property Type) (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Segment Reporting Information [Line Items]        
Rental Revenue: Office $ 633,803 $ 631,957 $ 1,270,403 $ 1,246,337
Rental Revenue: Residential 4,799 4,210 8,958 8,166
Rental Revenue: Hotel 14,607 13,375 23,709 20,795
Total revenue $ 653,209 $ 649,542 $ 1,303,070 $ 1,275,298
Rental Revenue: % of Grand Totals 100.00% 100.00% 100.00% 100.00%
Rental Expenses: Office $ 234,877 $ 228,819 $ 472,934 $ 455,555
Rental Expenses: Residential 2,913 1,635 5,185 3,186
Rental Expenses: Hotel 8,741 8,404 16,814 15,495
Rental Expenses: Total $ 246,531 $ 238,858 $ 494,933 $ 474,236
Rental Expenses: % Of Grand Totals 100.00% 100.00% 100.00% 100.00%
Net operating Income $ 406,678 $ 410,684 $ 808,137 $ 801,062
Net operating Income: % of Grand Totals 100.00% 100.00% 100.00% 100.00%
Boston [Member]        
Segment Reporting Information [Line Items]        
Rental Revenue: Office $ 207,810 $ 191,760 $ 412,807 $ 377,196
Rental Revenue: Residential 1,195 1,153 2,347 2,292
Rental Revenue: Hotel 14,607 13,375 23,709 20,795
Total revenue $ 223,612 $ 206,288 $ 438,863 $ 400,283
Rental Revenue: % of Grand Totals 34.23% 31.76% 33.68% 31.39%
Rental Expenses: Office $ 77,147 $ 74,160 $ 157,471 $ 149,416
Rental Expenses: Residential 706 545 1,220 1,040
Rental Expenses: Hotel 8,741 8,404 16,814 15,495
Rental Expenses: Total $ 86,594 $ 83,109 $ 175,505 $ 165,951
Rental Expenses: % Of Grand Totals 35.12% 34.79% 35.46% 34.99%
Net operating Income $ 137,018 $ 123,179 $ 263,358 $ 234,332
Net operating Income: % of Grand Totals 33.69% 29.99% 32.59% 29.25%
New York [Member]        
Segment Reporting Information [Line Items]        
Rental Revenue: Office $ 234,006 $ 251,844 $ 476,404 $ 493,414
Rental Revenue: Residential 0 0 0 0
Rental Revenue: Hotel 0 0 0 0
Total revenue $ 234,006 $ 251,844 $ 476,404 $ 493,414
Rental Revenue: % of Grand Totals 35.83% 38.77% 36.56% 38.69%
Rental Expenses: Office $ 91,838 $ 93,110 $ 185,600 $ 184,794
Rental Expenses: Residential 0 0 0 0
Rental Expenses: Hotel 0 0 0 0
Rental Expenses: Total $ 91,838 $ 93,110 $ 185,600 $ 184,794
Rental Expenses: % Of Grand Totals 37.26% 38.98% 37.50% 38.97%
Net operating Income $ 142,168 $ 158,734 $ 290,804 $ 308,620
Net operating Income: % of Grand Totals 34.96% 38.65% 35.98% 38.53%
San Francisco [Member]        
Segment Reporting Information [Line Items]        
Rental Revenue: Office $ 93,482 $ 85,483 $ 183,375 $ 170,124
Rental Revenue: Residential 0 0 0 0
Rental Revenue: Hotel 0 0 0 0
Total revenue $ 93,482 $ 85,483 $ 183,375 $ 170,124
Rental Revenue: % of Grand Totals 14.31% 13.16% 14.07% 13.34%
Rental Expenses: Office $ 31,214 $ 25,938 $ 58,842 $ 50,412
Rental Expenses: Residential 0 0 0 0
Rental Expenses: Hotel 0 0 0 0
Rental Expenses: Total $ 31,214 $ 25,938 $ 58,842 $ 50,412
Rental Expenses: % Of Grand Totals 12.66% 10.86% 11.89% 10.63%
Net operating Income $ 62,268 $ 59,545 $ 124,533 $ 119,712
Net operating Income: % of Grand Totals 15.31% 14.50% 15.41% 14.94%
Washington, DC [Member]        
Segment Reporting Information [Line Items]        
Rental Revenue: Office $ 98,505 $ 102,870 $ 197,817 $ 205,603
Rental Revenue: Residential 3,604 3,057 6,611 5,874
Rental Revenue: Hotel 0 0 0 0
Total revenue $ 102,109 $ 105,927 $ 204,428 $ 211,477
Rental Revenue: % of Grand Totals 15.63% 16.31% 15.69% 16.58%
Rental Expenses: Office $ 34,678 $ 35,611 $ 71,021 $ 70,933
Rental Expenses: Residential 2,207 1,090 3,965 2,146
Rental Expenses: Hotel 0 0 0 0
Rental Expenses: Total $ 36,885 $ 36,701 $ 74,986 $ 73,079
Rental Expenses: % Of Grand Totals 14.96% 15.37% 15.15% 15.41%
Net operating Income $ 65,224 $ 69,226 $ 129,442 $ 138,398
Net operating Income: % of Grand Totals 16.04% 16.86% 16.02% 17.28%