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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, 2017 | Sep. 30, 2016 | Sep. 30, 2017 | Sep. 30, 2016
Segment Reporting Information [Line Items] |  |  |  |
Rental Revenue: Office | $ 629,542 | $ 602,138 | $ 1,875,879 | $ 1,849,745
Rental Revenue: Residential | 4,295 | 4,372 | 12,461 | 12,509
Rental Revenue: Hotel | 13,064 | 12,354 | 33,859 | 33,919
Total revenue | $ 646,901 | $ 618,864 | $ 1,922,199 | $ 1,896,173
Rental Revenue: % of Grand Totals | 100.00% | 100.00% | 100.00% | 100.00%
Rental Expenses: Office | $ 235,764 | $ 226,337 | $ 691,319 | $ 660,241
Rental Expenses: Residential | 1,577 | 2,223 | 4,763 | 5,429
Rental Expenses: Hotel | 8,447 | 8,118 | 23,942 | 23,730
Rental Expenses: Total | $ 245,788 | $ 236,678 | $ 720,024 | $ 689,400
Rental Expenses: % Of Grand Totals | 100.00% | 100.00% | 100.00% | 100.00%
Net operating Income | $ 401,113 | $ 382,186 | $ 1,202,175 | $ 1,206,773
Net operating Income: % of Grand Totals | 100.00% | 100.00% | 100.00% | 100.00%
Boston [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Rental Revenue: Office | $ 196,687 | $ 183,975 | $ 573,883 | $ 540,850
Rental Revenue: Residential | 1,228 | 1,227 | 3,520 | 3,578
Rental Revenue: Hotel | 13,064 | 12,354 | 33,859 | 33,919
Total revenue | $ 210,979 | $ 197,556 | $ 611,262 | $ 578,347
Rental Revenue: % of Grand Totals | 32.61% | 31.92% | 31.80% | 30.50%
Rental Expenses: Office | $ 76,086 | $ 71,254 | $ 225,502 | $ 210,695
Rental Expenses: Residential | 512 | 1,141 | 1,552 | 2,174
Rental Expenses: Hotel | 8,447 | 8,118 | 23,942 | 23,730
Rental Expenses: Total | $ 85,045 | $ 80,513 | $ 250,996 | $ 236,599
Rental Expenses: % Of Grand Totals | 34.60% | 34.02% | 34.86% | 34.32%
Net operating Income | $ 125,934 | $ 117,043 | $ 360,266 | $ 341,748
Net operating Income: % of Grand Totals | 31.40% | 30.62% | 29.97% | 28.32%
New York [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Rental Revenue: Office | $ 242,071 | $ 237,262 | $ 735,485 | $ 773,077
Rental Revenue: Residential | 0 | 0 | 0 | 0
Rental Revenue: Hotel | 0 | 0 | 0 | 0
Total revenue | $ 242,071 | $ 237,262 | $ 735,485 | $ 773,077
Rental Revenue: % of Grand Totals | 37.43% | 38.34% | 38.27% | 40.77%
Rental Expenses: Office | $ 95,775 | $ 95,073 | $ 280,569 | $ 272,620
Rental Expenses: Residential | 0 | 0 | 0 | 0
Rental Expenses: Hotel | 0 | 0 | 0 | 0
Rental Expenses: Total | $ 95,775 | $ 95,073 | $ 280,569 | $ 272,620
Rental Expenses: % Of Grand Totals | 38.97% | 40.17% | 38.97% | 39.54%
Net operating Income | $ 146,296 | $ 142,189 | $ 454,916 | $ 500,457
Net operating Income: % of Grand Totals | 36.47% | 37.21% | 37.84% | 41.47%
San Francisco [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Rental Revenue: Office | $ 87,162 | $ 80,235 | $ 257,286 | $ 235,076
Rental Revenue: Residential | 0 | 0 | 0 | 0
Rental Revenue: Hotel | 0 | 0 | 0 | 0
Total revenue | $ 87,162 | $ 80,235 | $ 257,286 | $ 235,076
Rental Revenue: % of Grand Totals | 13.47% | 12.96% | 13.38% | 12.40%
Rental Expenses: Office | $ 26,792 | $ 26,037 | $ 77,204 | $ 75,412
Rental Expenses: Residential | 0 | 0 | 0 | 0
Rental Expenses: Hotel | 0 | 0 | 0 | 0
Rental Expenses: Total | $ 26,792 | $ 26,037 | $ 77,204 | $ 75,412
Rental Expenses: % Of Grand Totals | 10.90% | 11.00% | 10.72% | 10.94%
Net operating Income | $ 60,370 | $ 54,198 | $ 180,082 | $ 159,664
Net operating Income: % of Grand Totals | 15.05% | 14.18% | 14.98% | 13.23%
Washington, DC [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Rental Revenue: Office | $ 103,622 | $ 100,666 | $ 309,225 | $ 300,742
Rental Revenue: Residential | 3,067 | 3,145 | 8,941 | 8,931
Rental Revenue: Hotel | 0 | 0 | 0 | 0
Total revenue | $ 106,689 | $ 103,811 | $ 318,166 | $ 309,673
Rental Revenue: % of Grand Totals | 16.49% | 16.78% | 16.55% | 16.33%
Rental Expenses: Office | $ 37,111 | $ 33,973 | $ 108,044 | $ 101,514
Rental Expenses: Residential | 1,065 | 1,082 | 3,211 | 3,255
Rental Expenses: Hotel | 0 | 0 | 0 | 0
Rental Expenses: Total | $ 38,176 | $ 35,055 | $ 111,255 | $ 104,769
Rental Expenses: % Of Grand Totals | 15.53% | 14.81% | 15.45% | 15.20%
Net operating Income | $ 68,513 | $ 68,756 | $ 206,911 | $ 204,904
Net operating Income: % of Grand Totals | 17.08% | 17.99% | 17.21% | 16.98%

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