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Segment Information (Schedule Of Segment Reporting By Geographic Area And Property Type) (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Segment Reporting Information [Line Items] |  |  |
Rental Revenue: Class A Office | $ 2,505,272 | $ 2,460,953 | $ 2,403,338
Rental Revenue: Residential | 16,596 | 16,699 | 18,883
Rental Revenue: Hotel | 45,603 | 44,884 | 46,046
Rental Revenue Total | $ 2,567,471 | $ 2,522,536 | $ 2,468,267
Rental Revenue: % of Grand Totals | 100.00% | 100.00% | 100.00%
Rental Expenses: Class A Office | $ 923,675 | $ 882,692 | $ 864,025
Rental Expenses: Residential | 6,302 | 7,076 | 8,227
Rental Expenses: Hotel | 32,059 | 31,466 | 32,084
Rental Expenses: Total | $ 962,036 | $ 921,234 | $ 904,336
Rental Expenses: % Of Grand Totals | 100.00% | 100.00% | 100.00%
Net operating Income | $ 1,605,435 | $ 1,601,302 | $ 1,563,931
Net operating Income: % of Grand Totals | 100.00% | 100.00% | 100.00%
Boston [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Rental Revenue: Class A Office | $ 776,279 | $ 727,265 | $ 716,246
Rental Revenue: Residential | 4,745 | 4,812 | 4,801
Rental Revenue: Hotel | 45,603 | 44,884 | 46,046
Rental Revenue Total | $ 826,627 | $ 776,961 | $ 767,093
Rental Revenue: % of Grand Totals | 32.20% | 30.80% | 31.08%
Rental Expenses: Class A Office | $ 301,097 | $ 282,827 | $ 287,341
Rental Expenses: Residential | 2,044 | 2,708 | 2,006
Rental Expenses: Hotel | 32,059 | 31,466 | 32,084
Rental Expenses: Total | $ 335,200 | $ 317,001 | $ 321,431
Rental Expenses: % Of Grand Totals | 34.84% | 34.41% | 35.54%
Net operating Income | $ 491,427 | $ 459,960 | $ 445,662
Net operating Income: % of Grand Totals | 30.61% | 28.73% | 28.50%
New York [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Rental Revenue: Class A Office | $ 969,371 | $ 1,012,518 | $ 1,000,030
Rental Revenue: Residential | 0 | 0 | 0
Rental Revenue: Hotel | 0 | 0 | 0
Rental Revenue Total | $ 969,371 | $ 1,012,518 | $ 1,000,030
Rental Revenue: % of Grand Totals | 37.75% | 40.14% | 40.52%
Rental Expenses: Class A Office | $ 372,810 | $ 363,188 | $ 346,897
Rental Expenses: Residential | 0 | 0 | 0
Rental Expenses: Hotel | 0 | 0 | 0
Rental Expenses: Total | $ 372,810 | $ 363,188 | $ 346,897
Rental Expenses: % Of Grand Totals | 38.76% | 39.42% | 38.36%
Net operating Income | $ 596,561 | $ 649,330 | $ 653,133
Net operating Income: % of Grand Totals | 37.15% | 40.55% | 41.76%
San Francisco [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Rental Revenue: Class A Office | $ 345,519 | $ 318,609 | $ 302,434
Rental Revenue: Residential | 0 | 0 | 0
Rental Revenue: Hotel | 0 | 0 | 0
Rental Revenue Total | $ 345,519 | $ 318,609 | $ 302,434
Rental Revenue: % of Grand Totals | 13.46% | 12.63% | 12.25%
Rental Expenses: Class A Office | $ 105,253 | $ 100,787 | $ 98,206
Rental Expenses: Residential | 0 | 0 | 0
Rental Expenses: Hotel | 0 | 0 | 0
Rental Expenses: Total | $ 105,253 | $ 100,787 | $ 98,206
Rental Expenses: % Of Grand Totals | 10.94% | 10.94% | 10.86%
Net operating Income | $ 240,266 | $ 217,822 | $ 204,228
Net operating Income: % of Grand Totals | 14.97% | 13.60% | 13.06%
Washington, DC [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Rental Revenue: Class A Office | $ 414,103 | $ 402,561 | $ 384,628
Rental Revenue: Residential | 11,851 | 11,887 | 14,082
Rental Revenue: Hotel | 0 | 0 | 0
Rental Revenue Total | $ 425,954 | $ 414,448 | $ 398,710
Rental Revenue: % of Grand Totals | 16.59% | 16.43% | 16.15%
Rental Expenses: Class A Office | $ 144,515 | $ 135,890 | $ 131,581
Rental Expenses: Residential | 4,258 | 4,368 | 6,221
Rental Expenses: Hotel | 0 | 0 | 0
Rental Expenses: Total | $ 148,773 | $ 140,258 | $ 137,802
Rental Expenses: % Of Grand Totals | 15.46% | 15.23% | 15.24%
Net operating Income | $ 277,181 | $ 274,190 | $ 260,908
Net operating Income: % of Grand Totals | 17.27% | 17.12% | 16.68%

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