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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, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017
Segment Reporting Information [Line Items] |  |  |  |
Rental Revenue: Office | $ 648,531 | $ 629,542 | $ 1,918,934 | $ 1,875,879
Rental Revenue: Residential | 6,320 | 4,295 | 15,278 | 12,461
Rental Revenue: Hotel | 13,664 | 13,064 | 37,373 | 33,859
Total revenue | $ 668,515 | $ 646,901 | $ 1,971,585 | $ 1,922,199
Rental Revenue: % of Grand Totals | 100.00% | 100.00% | 100.00% | 100.00%
Rental Expenses: Office | $ 244,265 | $ 235,764 | $ 717,199 | $ 691,319
Rental Expenses: Residential | 3,724 | 1,577 | 8,909 | 4,763
Rental Expenses: Hotel | 8,828 | 8,447 | 25,642 | 23,942
Rental Expenses: Total | $ 256,817 | $ 245,788 | $ 751,750 | $ 720,024
Rental Expenses: % Of Grand Totals | 100.00% | 100.00% | 100.00% | 100.00%
Net operating Income | $ 411,698 | $ 401,113 | $ 1,219,835 | $ 1,202,175
Net operating Income: % of Grand Totals | 100.00% | 100.00% | 100.00% | 100.00%
Boston [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Rental Revenue: Office | $ 210,277 | $ 196,687 | $ 623,084 | $ 573,883
Rental Revenue: Residential | 1,905 | 1,228 | 4,252 | 3,520
Rental Revenue: Hotel | 13,664 | 13,064 | 37,373 | 33,859
Total revenue | $ 225,846 | $ 210,979 | $ 664,709 | $ 611,262
Rental Revenue: % of Grand Totals | 33.78% | 32.61% | 33.71% | 31.80%
Rental Expenses: Office | $ 78,089 | $ 76,086 | $ 235,560 | $ 225,502
Rental Expenses: Residential | 1,159 | 512 | 2,379 | 1,552
Rental Expenses: Hotel | 8,828 | 8,447 | 25,642 | 23,942
Rental Expenses: Total | $ 88,076 | $ 85,045 | $ 263,581 | $ 250,996
Rental Expenses: % Of Grand Totals | 34.30% | 34.60% | 35.06% | 34.86%
Net operating Income | $ 137,770 | $ 125,934 | $ 401,128 | $ 360,266
Net operating Income: % of Grand Totals | 33.46% | 31.40% | 32.88% | 29.97%
New York [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Rental Revenue: Office | $ 237,944 | $ 242,071 | $ 714,348 | $ 735,485
Rental Revenue: Residential | 0 | 0 | 0 | 0
Rental Revenue: Hotel | 0 | 0 | 0 | 0
Total revenue | $ 237,944 | $ 242,071 | $ 714,348 | $ 735,485
Rental Revenue: % of Grand Totals | 35.60% | 37.43% | 36.23% | 38.27%
Rental Expenses: Office | $ 96,795 | $ 95,775 | $ 282,395 | $ 280,569
Rental Expenses: Residential | 0 | 0 | 0 | 0
Rental Expenses: Hotel | 0 | 0 | 0 | 0
Rental Expenses: Total | $ 96,795 | $ 95,775 | $ 282,395 | $ 280,569
Rental Expenses: % Of Grand Totals | 37.68% | 38.97% | 37.57% | 38.97%
Net operating Income | $ 141,149 | $ 146,296 | $ 431,953 | $ 454,916
Net operating Income: % of Grand Totals | 34.29% | 36.47% | 35.41% | 37.84%
San Francisco [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Rental Revenue: Office | $ 102,035 | $ 87,162 | $ 285,410 | $ 257,286
Rental Revenue: Residential | 0 | 0 | 0 | 0
Rental Revenue: Hotel | 0 | 0 | 0 | 0
Total revenue | $ 102,035 | $ 87,162 | $ 285,410 | $ 257,286
Rental Revenue: % of Grand Totals | 15.26% | 13.47% | 14.48% | 13.38%
Rental Expenses: Office | $ 34,016 | $ 26,792 | $ 92,858 | $ 77,204
Rental Expenses: Residential | 0 | 0 | 0 | 0
Rental Expenses: Hotel | 0 | 0 | 0 | 0
Rental Expenses: Total | $ 34,016 | $ 26,792 | $ 92,858 | $ 77,204
Rental Expenses: % Of Grand Totals | 13.25% | 10.90% | 12.35% | 10.72%
Net operating Income | $ 68,019 | $ 60,370 | $ 192,552 | $ 180,082
Net operating Income: % of Grand Totals | 16.52% | 15.05% | 15.79% | 14.98%
Washington, DC [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Rental Revenue: Office | $ 98,275 | $ 103,622 | $ 296,092 | $ 309,225
Rental Revenue: Residential | 4,415 | 3,067 | 11,026 | 8,941
Rental Revenue: Hotel | 0 | 0 | 0 | 0
Total revenue | $ 102,690 | $ 106,689 | $ 307,118 | $ 318,166
Rental Revenue: % of Grand Totals | 15.36% | 16.49% | 15.58% | 16.55%
Rental Expenses: Office | $ 35,365 | $ 37,111 | $ 106,386 | $ 108,044
Rental Expenses: Residential | 2,565 | 1,065 | 6,530 | 3,211
Rental Expenses: Hotel | 0 | 0 | 0 | 0
Rental Expenses: Total | $ 37,930 | $ 38,176 | $ 112,916 | $ 111,255
Rental Expenses: % Of Grand Totals | 14.77% | 15.53% | 15.02% | 15.45%
Net operating Income | $ 64,760 | $ 68,513 | $ 194,202 | $ 206,911
Net operating Income: % of Grand Totals | 15.73% | 17.08% | 15.92% | 17.21%

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