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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, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Segment Reporting Information [Line Items] |  |  |
Rental Revenue: Class A Office | $ 2,590,659 | $ 2,505,272 | $ 2,460,953
Rental Revenue: Residential | 22,551 | 16,596 | 16,699
Rental Revenue: Hotel | 49,118 | 45,603 | 44,884
Rental Revenue Total | $ 2,662,328 | $ 2,567,471 | $ 2,522,536
Rental Revenue: % of Grand Totals | 100.00% | 100.00% | 100.00%
Rental Expenses: Class A Office | $ 966,547 | $ 923,675 | $ 882,692
Rental Expenses: Residential | 12,604 | 6,302 | 7,076
Rental Expenses: Hotel | 33,863 | 32,059 | 31,466
Rental Expenses: Total | $ 1,013,014 | $ 962,036 | $ 921,234
Rental Expenses: % Of Grand Totals | 100.00% | 100.00% | 100.00%
Net Operating Income | $ 1,649,314 | $ 1,605,435 | $ 1,601,302
Net Operating Income: % of Grand Totals | 100.00% | 100.00% | 100.00%
Boston [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Rental Revenue: Class A Office | $ 838,341 | $ 776,279 | $ 727,265
Rental Revenue: Residential | 6,694 | 4,745 | 4,812
Rental Revenue: Hotel | 49,118 | 45,603 | 44,884
Rental Revenue Total | $ 894,153 | $ 826,627 | $ 776,961
Rental Revenue: % of Grand Totals | 33.59% | 32.20% | 30.80%
Rental Expenses: Class A Office | $ 315,653 | $ 301,097 | $ 282,827
Rental Expenses: Residential | 3,632 | 2,044 | 2,708
Rental Expenses: Hotel | 33,863 | 32,059 | 31,466
Rental Expenses: Total | $ 353,148 | $ 335,200 | $ 317,001
Rental Expenses: % Of Grand Totals | 34.86% | 34.84% | 34.41%
Net Operating Income | $ 541,005 | $ 491,427 | $ 459,960
Net Operating Income: % of Grand Totals | 32.80% | 30.61% | 28.73%
New York [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Rental Revenue: Class A Office | $ 959,050 | $ 969,371 | $ 1,012,518
Rental Revenue: Residential | 0 | 0 | 0
Rental Revenue: Hotel | 0 | 0 | 0
Rental Revenue Total | $ 959,050 | $ 969,371 | $ 1,012,518
Rental Revenue: % of Grand Totals | 36.02% | 37.75% | 40.14%
Rental Expenses: Class A Office | $ 377,992 | $ 372,810 | $ 363,188
Rental Expenses: Residential | 0 | 0 | 0
Rental Expenses: Hotel | 0 | 0 | 0
Rental Expenses: Total | $ 377,992 | $ 372,810 | $ 363,188
Rental Expenses: % Of Grand Totals | 37.32% | 38.76% | 39.42%
Net Operating Income | $ 581,058 | $ 596,561 | $ 649,330
Net Operating Income: % of Grand Totals | 35.23% | 37.15% | 40.55%
San Francisco [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Rental Revenue: Class A Office | $ 397,180 | $ 345,519 | $ 318,609
Rental Revenue: Residential | 0 | 0 | 0
Rental Revenue: Hotel | 0 | 0 | 0
Rental Revenue Total | $ 397,180 | $ 345,519 | $ 318,609
Rental Revenue: % of Grand Totals | 14.92% | 13.46% | 12.63%
Rental Expenses: Class A Office | $ 130,016 | $ 105,253 | $ 100,787
Rental Expenses: Residential | 0 | 0 | 0
Rental Expenses: Hotel | 0 | 0 | 0
Rental Expenses: Total | $ 130,016 | $ 105,253 | $ 100,787
Rental Expenses: % Of Grand Totals | 12.83% | 10.94% | 10.94%
Net Operating Income | $ 267,164 | $ 240,266 | $ 217,822
Net Operating Income: % of Grand Totals | 16.20% | 14.97% | 13.60%
Washington, DC [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Rental Revenue: Class A Office | $ 396,088 | $ 414,103 | $ 402,561
Rental Revenue: Residential | 15,857 | 11,851 | 11,887
Rental Revenue: Hotel | 0 | 0 | 0
Rental Revenue Total | $ 411,945 | $ 425,954 | $ 414,448
Rental Revenue: % of Grand Totals | 15.47% | 16.59% | 16.43%
Rental Expenses: Class A Office | $ 142,886 | $ 144,515 | $ 135,890
Rental Expenses: Residential | 8,972 | 4,258 | 4,368
Rental Expenses: Hotel | 0 | 0 | 0
Rental Expenses: Total | $ 151,858 | $ 148,773 | $ 140,258
Rental Expenses: % Of Grand Totals | 14.99% | 15.46% | 15.23%
Net Operating Income | $ 260,087 | $ 277,181 | $ 274,190
Net Operating Income: % of Grand Totals | 15.77% | 17.27% | 17.12%

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