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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, 2018 | Mar. 31, 2017
Segment Reporting Information [Line Items] |  |
Rental Revenue: Office | $ 636,600 | $ 614,380
Rental Revenue: Residential | 4,159 | 3,956
Rental Revenue: Hotel | 9,102 | 7,420
Total revenue | $ 649,861 | $ 625,756
Rental Revenue: % of Grand Totals | 100.00% | 100.00%
Rental Expenses: Office | $ 238,057 | $ 226,736
Rental Expenses: Residential | 2,272 | 1,551
Rental Expenses: Hotel | 8,073 | 7,091
Rental Expenses: Total | $ 248,402 | $ 235,378
Rental Expenses: % Of Grand Totals | 100.00% | 100.00%
Net operating Income | $ 401,459 | $ 390,378
Net operating Income: % of Grand Totals | 100.00% | 100.00%
Boston [Member] |  |
Segment Reporting Information [Line Items] |  |
Rental Revenue: Office | $ 204,997 | $ 185,436
Rental Revenue: Residential | 1,152 | 1,139
Rental Revenue: Hotel | 9,102 | 7,420
Total revenue | $ 215,251 | $ 193,995
Rental Revenue: % of Grand Totals | 33.12% | 31.00%
Rental Expenses: Office | $ 80,324 | $ 75,256
Rental Expenses: Residential | 514 | 495
Rental Expenses: Hotel | 8,073 | 7,091
Rental Expenses: Total | $ 88,911 | $ 82,842
Rental Expenses: % Of Grand Totals | 35.79% | 35.19%
Net operating Income | $ 126,340 | $ 111,153
Net operating Income: % of Grand Totals | 31.47% | 28.47%
New York [Member] |  |
Segment Reporting Information [Line Items] |  |
Rental Revenue: Office | $ 242,398 | $ 241,570
Rental Revenue: Residential | 0 | 0
Rental Revenue: Hotel | 0 | 0
Total revenue | $ 242,398 | $ 241,570
Rental Revenue: % of Grand Totals | 37.31% | 38.60%
Rental Expenses: Office | $ 93,762 | $ 91,684
Rental Expenses: Residential | 0 | 0
Rental Expenses: Hotel | 0 | 0
Rental Expenses: Total | $ 93,762 | $ 91,684
Rental Expenses: % Of Grand Totals | 37.75% | 38.95%
Net operating Income | $ 148,636 | $ 149,886
Net operating Income: % of Grand Totals | 37.02% | 38.40%
San Francisco [Member] |  |
Segment Reporting Information [Line Items] |  |
Rental Revenue: Office | $ 89,893 | $ 84,641
Rental Revenue: Residential | 0 | 0
Rental Revenue: Hotel | 0 | 0
Total revenue | $ 89,893 | $ 84,641
Rental Revenue: % of Grand Totals | 13.83% | 13.53%
Rental Expenses: Office | $ 27,628 | $ 24,474
Rental Expenses: Residential | 0 | 0
Rental Expenses: Hotel | 0 | 0
Rental Expenses: Total | $ 27,628 | $ 24,474
Rental Expenses: % Of Grand Totals | 11.12% | 10.40%
Net operating Income | $ 62,265 | $ 60,167
Net operating Income: % of Grand Totals | 15.51% | 15.41%
Washington, DC [Member] |  |
Segment Reporting Information [Line Items] |  |
Rental Revenue: Office | $ 99,312 | $ 102,733
Rental Revenue: Residential | 3,007 | 2,817
Rental Revenue: Hotel | 0 | 0
Total revenue | $ 102,319 | $ 105,550
Rental Revenue: % of Grand Totals | 15.74% | 16.87%
Rental Expenses: Office | $ 36,343 | $ 35,322
Rental Expenses: Residential | 1,758 | 1,056
Rental Expenses: Hotel | 0 | 0
Rental Expenses: Total | $ 38,101 | $ 36,378
Rental Expenses: % Of Grand Totals | 15.34% | 15.46%
Net operating Income | $ 64,218 | $ 69,172
Net operating Income: % of Grand Totals | 16.00% | 17.72%

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