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Segment Information (Schedule Of Segment Reporting By Geographic Area And Property Type) (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2016 | Jun. 30, 2015 | Jun. 30, 2016 | Jun. 30, 2015
Segment Reporting Information [Line Items] |  |  |  |
Rental Revenue: Office | $ 601,117 | $ 596,145 | $ 1,247,607 | $ 1,193,354
Rental Revenue: Residential | 4,088 | 3,811 | 8,137 | 10,665
Rental Revenue: Hotel | 12,808 | 13,403 | 21,565 | 22,488
Total revenue | $ 618,013 | $ 613,359 | $ 1,277,309 | $ 1,226,507
Rental Revenue: % of Grand Totals | 100.00% | 100.00% | 100.00% | 100.00%
Rental Expenses: Office | $ 216,332 | $ 212,933 | $ 433,904 | $ 430,737
Rental Expenses: Residential | 1,606 | 1,531 | 3,206 | 5,077
Rental Expenses: Hotel | 7,978 | 8,495 | 15,612 | 16,071
Rental Expenses: Total | $ 225,916 | $ 222,959 | $ 452,722 | $ 451,885
Rental Expenses: % Of Grand Totals | 100.00% | 100.00% | 100.00% | 100.00%
Net operating Income | $ 392,097 | $ 390,400 | $ 824,587 | $ 774,622
Net operating Income: % of Grand Totals | 100.00% | 100.00% | 100.00% | 100.00%
Boston [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Rental Revenue: Office | $ 179,048 | $ 180,936 | $ 356,875 | $ 356,963
Rental Revenue: Residential | 1,180 | 1,131 | 2,351 | 2,309
Rental Revenue: Hotel | 12,808 | 13,403 | 21,565 | 22,488
Total revenue | $ 193,036 | $ 195,470 | $ 380,791 | $ 381,760
Rental Revenue: % of Grand Totals | 31.24% | 31.87% | 29.81% | 31.13%
Rental Expenses: Office | $ 68,754 | $ 69,653 | $ 139,441 | $ 146,104
Rental Expenses: Residential | 513 | 511 | 1,033 | 1,020
Rental Expenses: Hotel | 7,978 | 8,495 | 15,612 | 16,071
Rental Expenses: Total | $ 77,245 | $ 78,659 | $ 156,086 | $ 163,195
Rental Expenses: % Of Grand Totals | 34.19% | 35.28% | 34.47% | 36.12%
Net operating Income | $ 115,791 | $ 116,811 | $ 224,705 | $ 218,565
Net operating Income: % of Grand Totals | 29.53% | 29.92% | 27.25% | 28.22%
New York [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Rental Revenue: Office | $ 243,957 | $ 246,432 | $ 535,815 | $ 499,530
Rental Revenue: Residential | 0 | 0 | 0 | 0
Rental Revenue: Hotel | 0 | 0 | 0 | 0
Total revenue | $ 243,957 | $ 246,432 | $ 535,815 | $ 499,530
Rental Revenue: % of Grand Totals | 39.47% | 40.18% | 41.95% | 40.73%
Rental Expenses: Office | $ 88,749 | $ 85,661 | $ 177,547 | $ 170,722
Rental Expenses: Residential | 0 | 0 | 0 | 0
Rental Expenses: Hotel | 0 | 0 | 0 | 0
Rental Expenses: Total | $ 88,749 | $ 85,661 | $ 177,547 | $ 170,722
Rental Expenses: % Of Grand Totals | 39.29% | 38.42% | 39.22% | 37.78%
Net operating Income | $ 155,208 | $ 160,771 | $ 358,268 | $ 328,808
Net operating Income: % of Grand Totals | 39.59% | 41.18% | 43.45% | 42.45%
San Francisco [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Rental Revenue: Office | $ 78,524 | $ 74,335 | $ 154,841 | $ 146,246
Rental Revenue: Residential | 0 | 0 | 0 | 0
Rental Revenue: Hotel | 0 | 0 | 0 | 0
Total revenue | $ 78,524 | $ 74,335 | $ 154,841 | $ 146,246
Rental Revenue: % of Grand Totals | 12.71% | 12.12% | 12.12% | 11.92%
Rental Expenses: Office | $ 25,470 | $ 24,415 | $ 49,375 | $ 47,236
Rental Expenses: Residential | 0 | 0 | 0 | 0
Rental Expenses: Hotel | 0 | 0 | 0 | 0
Rental Expenses: Total | $ 25,470 | $ 24,415 | $ 49,375 | $ 47,236
Rental Expenses: % Of Grand Totals | 11.27% | 10.95% | 10.91% | 10.45%
Net operating Income | $ 53,054 | $ 49,920 | $ 105,466 | $ 99,010
Net operating Income: % of Grand Totals | 13.53% | 12.79% | 12.79% | 12.78%
Washington, DC [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Rental Revenue: Office | $ 99,588 | $ 94,442 | $ 200,076 | $ 190,615
Rental Revenue: Residential | 2,908 | 2,680 | 5,786 | 8,356
Rental Revenue: Hotel | 0 | 0 | 0 | 0
Total revenue | $ 102,496 | $ 97,122 | $ 205,862 | $ 198,971
Rental Revenue: % of Grand Totals | 16.58% | 15.83% | 16.12% | 16.22%
Rental Expenses: Office | $ 33,359 | $ 33,204 | $ 67,541 | $ 66,675
Rental Expenses: Residential | 1,093 | 1,020 | 2,173 | 4,057
Rental Expenses: Hotel | 0 | 0 | 0 | 0
Rental Expenses: Total | $ 34,452 | $ 34,224 | $ 69,714 | $ 70,732
Rental Expenses: % Of Grand Totals | 15.25% | 15.35% | 15.40% | 15.65%
Net operating Income | $ 68,044 | $ 62,898 | $ 136,148 | $ 128,239
Net operating Income: % of Grand Totals | 17.35% | 16.11% | 16.51% | 16.55%

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