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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, 2016
Sep. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
Segment Reporting Information [Line Items]        
Rental Revenue: Office $ 602,138 $ 607,242 $ 1,849,745 $ 1,800,596
Rental Revenue: Residential 4,372 4,111 12,509 14,776
Rental Revenue: Hotel 12,354 12,619 33,919 35,107
Total revenue $ 618,864 $ 623,972 $ 1,896,173 $ 1,850,479
Rental Revenue: % of Grand Totals 100.00% 100.00% 100.00% 100.00%
Rental Expenses: Office $ 226,337 $ 218,262 $ 660,241 $ 648,999
Rental Expenses: Residential 2,223 1,534 5,429 6,611
Rental Expenses: Hotel 8,118 8,125 23,730 24,196
Rental Expenses: Total $ 236,678 $ 227,921 $ 689,400 $ 679,806
Rental Expenses: % Of Grand Totals 100.00% 100.00% 100.00% 100.00%
Net operating Income $ 382,186 $ 396,051 $ 1,206,773 $ 1,170,673
Net operating Income: % of Grand Totals 100.00% 100.00% 100.00% 100.00%
Boston [Member]        
Segment Reporting Information [Line Items]        
Rental Revenue: Office $ 183,975 $ 179,278 $ 540,850 $ 536,241
Rental Revenue: Residential 1,227 1,275 3,578 3,584
Rental Revenue: Hotel 12,354 12,619 33,919 35,107
Total revenue $ 197,556 $ 193,172 $ 578,347 $ 574,932
Rental Revenue: % of Grand Totals 31.92% 30.96% 30.50% 31.07%
Rental Expenses: Office $ 71,254 $ 71,898 $ 210,695 $ 218,002
Rental Expenses: Residential 1,141 485 2,174 1,505
Rental Expenses: Hotel 8,118 8,125 23,730 24,196
Rental Expenses: Total $ 80,513 $ 80,508 $ 236,599 $ 243,703
Rental Expenses: % Of Grand Totals 34.02% 35.32% 34.32% 35.85%
Net operating Income $ 117,043 $ 112,664 $ 341,748 $ 331,229
Net operating Income: % of Grand Totals 30.62% 28.45% 28.32% 28.29%
New York [Member]        
Segment Reporting Information [Line Items]        
Rental Revenue: Office $ 237,262 $ 253,612 $ 773,077 $ 753,142
Rental Revenue: Residential 0 0 0 0
Rental Revenue: Hotel 0 0 0 0
Total revenue $ 237,262 $ 253,612 $ 773,077 $ 753,142
Rental Revenue: % of Grand Totals 38.34% 40.64% 40.77% 40.70%
Rental Expenses: Office $ 95,073 $ 88,496 $ 272,620 $ 259,218
Rental Expenses: Residential 0 0 0 0
Rental Expenses: Hotel 0 0 0 0
Rental Expenses: Total $ 95,073 $ 88,496 $ 272,620 $ 259,218
Rental Expenses: % Of Grand Totals 40.17% 38.83% 39.54% 38.13%
Net operating Income $ 142,189 $ 165,116 $ 500,457 $ 493,924
Net operating Income: % of Grand Totals 37.21% 41.69% 41.47% 42.19%
San Francisco [Member]        
Segment Reporting Information [Line Items]        
Rental Revenue: Office $ 80,235 $ 77,315 $ 235,076 $ 223,561
Rental Revenue: Residential 0 0 0 0
Rental Revenue: Hotel 0 0 0 0
Total revenue $ 80,235 $ 77,315 $ 235,076 $ 223,561
Rental Revenue: % of Grand Totals 12.96% 12.39% 12.40% 12.08%
Rental Expenses: Office $ 26,037 $ 25,883 $ 75,412 $ 73,119
Rental Expenses: Residential 0 0 0 0
Rental Expenses: Hotel 0 0 0 0
Rental Expenses: Total $ 26,037 $ 25,883 $ 75,412 $ 73,119
Rental Expenses: % Of Grand Totals 11.00% 11.36% 10.94% 10.76%
Net operating Income $ 54,198 $ 51,432 $ 159,664 $ 150,442
Net operating Income: % of Grand Totals 14.18% 12.98% 13.23% 12.85%
Washington, DC [Member]        
Segment Reporting Information [Line Items]        
Rental Revenue: Office $ 100,666 $ 97,037 $ 300,742 $ 287,652
Rental Revenue: Residential 3,145 2,836 8,931 11,192
Rental Revenue: Hotel 0 0 0 0
Total revenue $ 103,811 $ 99,873 $ 309,673 $ 298,844
Rental Revenue: % of Grand Totals 16.78% 16.01% 16.33% 16.15%
Rental Expenses: Office $ 33,973 $ 31,985 $ 101,514 $ 98,660
Rental Expenses: Residential 1,082 1,049 3,255 5,106
Rental Expenses: Hotel 0 0 0 0
Rental Expenses: Total $ 35,055 $ 33,034 $ 104,769 $ 103,766
Rental Expenses: % Of Grand Totals 14.81% 14.49% 15.20% 15.26%
Net operating Income $ 68,756 $ 66,839 $ 204,904 $ 195,078
Net operating Income: % of Grand Totals 17.99% 16.88% 16.98% 16.67%