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Segment Information (Schedule Of Segment Reporting By Geographic Area And Property Type) (Details) - USD ($) $ in Thousands | 3 Months Ended
--- | ---
Mar. 31, 2016 | Mar. 31, 2015
Segment Reporting Information [Line Items] |  |
Rental Revenue: Office | $ 646,490 | $ 597,209
Rental Revenue: Residential | 4,049 | 6,854
Rental Revenue: Hotel | 8,757 | 9,085
Total revenue | $ 659,296 | $ 613,148
Rental Revenue: % of Grand Totals | 100.00% | 100.00%
Rental Expenses: Office | $ 217,572 | $ 217,804
Rental Expenses: Residential | 1,600 | 3,546
Rental Expenses: Hotel | 7,634 | 7,576
Rental Expenses: Total | $ 226,806 | $ 228,926
Rental Expenses: % Of Grand Totals | 100.00% | 100.00%
Net operating Income | $ 432,490 | $ 384,222
Net operating Income: % of Grand Totals | 100.00% | 100.00%
Boston [Member] |  |
Segment Reporting Information [Line Items] |  |
Rental Revenue: Office | $ 177,827 | $ 176,027
Rental Revenue: Residential | 1,171 | 1,178
Rental Revenue: Hotel | 8,757 | 9,085
Total revenue | $ 187,755 | $ 186,290
Rental Revenue: % of Grand Totals | 28.48% | 30.38%
Rental Expenses: Office | $ 70,687 | $ 76,451
Rental Expenses: Residential | 520 | 509
Rental Expenses: Hotel | 7,634 | 7,576
Rental Expenses: Total | $ 78,841 | $ 84,536
Rental Expenses: % Of Grand Totals | 34.76% | 36.92%
Net operating Income | $ 108,914 | $ 101,754
Net operating Income: % of Grand Totals | 25.18% | 26.48%
New York [Member] |  |
Segment Reporting Information [Line Items] |  |
Rental Revenue: Office | $ 291,858 | $ 253,098
Rental Revenue: Residential | 0 | 0
Rental Revenue: Hotel | 0 | 0
Total revenue | $ 291,858 | $ 253,098
Rental Revenue: % of Grand Totals | 44.27% | 41.28%
Rental Expenses: Office | $ 88,798 | $ 85,061
Rental Expenses: Residential | 0 | 0
Rental Expenses: Hotel | 0 | 0
Rental Expenses: Total | $ 88,798 | $ 85,061
Rental Expenses: % Of Grand Totals | 39.15% | 37.16%
Net operating Income | $ 203,060 | $ 168,037
Net operating Income: % of Grand Totals | 46.95% | 43.73%
San Francisco [Member] |  |
Segment Reporting Information [Line Items] |  |
Rental Revenue: Office | $ 76,317 | $ 71,911
Rental Revenue: Residential | 0 | 0
Rental Revenue: Hotel | 0 | 0
Total revenue | $ 76,317 | $ 71,911
Rental Revenue: % of Grand Totals | 11.57% | 11.73%
Rental Expenses: Office | $ 23,905 | $ 22,821
Rental Expenses: Residential | 0 | 0
Rental Expenses: Hotel | 0 | 0
Rental Expenses: Total | $ 23,905 | $ 22,821
Rental Expenses: % Of Grand Totals | 10.54% | 9.97%
Net operating Income | $ 52,412 | $ 49,090
Net operating Income: % of Grand Totals | 12.12% | 12.78%
Washington, DC [Member] |  |
Segment Reporting Information [Line Items] |  |
Rental Revenue: Office | $ 100,488 | $ 96,173
Rental Revenue: Residential | 2,878 | 5,676
Rental Revenue: Hotel | 0 | 0
Total revenue | $ 103,366 | $ 101,849
Rental Revenue: % of Grand Totals | 15.68% | 16.61%
Rental Expenses: Office | $ 34,182 | $ 33,471
Rental Expenses: Residential | 1,080 | 3,037
Rental Expenses: Hotel | 0 | 0
Rental Expenses: Total | $ 35,262 | $ 36,508
Rental Expenses: % Of Grand Totals | 15.55% | 15.95%
Net operating Income | $ 68,104 | $ 65,341
Net operating Income: % of Grand Totals | 15.75% | 17.01%

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