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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, 2017 | Mar. 31, 2016
Segment Reporting Information [Line Items] |  |
Rental Revenue: Office | $ 614,380 | $ 646,490
Rental Revenue: Residential | 3,956 | 4,049
Rental Revenue: Hotel | 7,420 | 8,757
Total revenue | $ 625,756 | $ 659,296
Rental Revenue: % of Grand Totals | 100.00% | 100.00%
Rental Expenses: Office | $ 226,736 | $ 217,572
Rental Expenses: Residential | 1,551 | 1,600
Rental Expenses: Hotel | 7,091 | 7,634
Rental Expenses: Total | $ 235,378 | $ 226,806
Rental Expenses: % Of Grand Totals | 100.00% | 100.00%
Net operating Income | $ 390,378 | $ 432,490
Net operating Income: % of Grand Totals | 100.00% | 100.00%
Boston [Member] |  |
Segment Reporting Information [Line Items] |  |
Rental Revenue: Office | $ 185,436 | $ 177,827
Rental Revenue: Residential | 1,139 | 1,171
Rental Revenue: Hotel | 7,420 | 8,757
Total revenue | $ 193,995 | $ 187,755
Rental Revenue: % of Grand Totals | 31.00% | 28.48%
Rental Expenses: Office | $ 75,256 | $ 70,687
Rental Expenses: Residential | 495 | 520
Rental Expenses: Hotel | 7,091 | 7,634
Rental Expenses: Total | $ 82,842 | $ 78,841
Rental Expenses: % Of Grand Totals | 35.19% | 34.76%
Net operating Income | $ 111,153 | $ 108,914
Net operating Income: % of Grand Totals | 28.47% | 25.18%
New York [Member] |  |
Segment Reporting Information [Line Items] |  |
Rental Revenue: Office | $ 241,570 | $ 291,858
Rental Revenue: Residential | 0 | 0
Rental Revenue: Hotel | 0 | 0
Total revenue | $ 241,570 | $ 291,858
Rental Revenue: % of Grand Totals | 38.60% | 44.27%
Rental Expenses: Office | $ 91,684 | $ 88,798
Rental Expenses: Residential | 0 | 0
Rental Expenses: Hotel | 0 | 0
Rental Expenses: Total | $ 91,684 | $ 88,798
Rental Expenses: % Of Grand Totals | 38.95% | 39.15%
Net operating Income | $ 149,886 | $ 203,060
Net operating Income: % of Grand Totals | 38.40% | 46.95%
San Francisco [Member] |  |
Segment Reporting Information [Line Items] |  |
Rental Revenue: Office | $ 84,641 | $ 76,317
Rental Revenue: Residential | 0 | 0
Rental Revenue: Hotel | 0 | 0
Total revenue | $ 84,641 | $ 76,317
Rental Revenue: % of Grand Totals | 13.53% | 11.57%
Rental Expenses: Office | $ 24,474 | $ 23,905
Rental Expenses: Residential | 0 | 0
Rental Expenses: Hotel | 0 | 0
Rental Expenses: Total | $ 24,474 | $ 23,905
Rental Expenses: % Of Grand Totals | 10.40% | 10.54%
Net operating Income | $ 60,167 | $ 52,412
Net operating Income: % of Grand Totals | 15.41% | 12.12%
Washington, DC [Member] |  |
Segment Reporting Information [Line Items] |  |
Rental Revenue: Office | $ 102,733 | $ 100,488
Rental Revenue: Residential | 2,817 | 2,878
Rental Revenue: Hotel | 0 | 0
Total revenue | $ 105,550 | $ 103,366
Rental Revenue: % of Grand Totals | 16.87% | 15.68%
Rental Expenses: Office | $ 35,322 | $ 34,182
Rental Expenses: Residential | 1,056 | 1,080
Rental Expenses: Hotel | 0 | 0
Rental Expenses: Total | $ 36,378 | $ 35,262
Rental Expenses: % Of Grand Totals | 15.46% | 15.55%
Net operating Income | $ 69,172 | $ 68,104
Net operating Income: % of Grand Totals | 17.72% | 15.75%

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