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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, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Segment Reporting Information [Line Items] |  |  |
Rental Revenue: Class A Office | $ 2,460,953 | $ 2,403,338 | $ 2,302,104
Rental Revenue: Residential | 16,699 | 18,883 | 26,193
Rental Revenue: Hotel | 44,884 | 46,046 | 43,385
Rental Revenue Total | $ 2,522,536 | $ 2,468,267 | $ 2,371,682
Rental Revenue: % of Grand Totals | 100.00% | 100.00% | 100.00%
Rental Expenses: Class A Office | $ 882,692 | $ 864,025 | $ 819,368
Rental Expenses: Residential | 7,076 | 8,227 | 15,922
Rental Expenses: Hotel | 31,466 | 32,084 | 29,236
Rental Expenses: Total | $ 921,234 | $ 904,336 | $ 864,526
Rental Expenses: % Of Grand Totals | 100.00% | 100.00% | 100.00%
Net operating Income | $ 1,601,302 | $ 1,563,931 | $ 1,507,156
Net operating Income: % of Grand Totals | 100.00% | 100.00% | 100.00%
Boston [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Rental Revenue: Class A Office | $ 727,265 | $ 716,246 | $ 715,917
Rental Revenue: Residential | 4,812 | 4,801 | 4,528
Rental Revenue: Hotel | 44,884 | 46,046 | 43,385
Rental Revenue Total | $ 776,961 | $ 767,093 | $ 763,830
Rental Revenue: % of Grand Totals | 30.80% | 31.08% | 32.21%
Rental Expenses: Class A Office | $ 282,827 | $ 287,341 | $ 278,120
Rental Expenses: Residential | 2,708 | 2,006 | 1,957
Rental Expenses: Hotel | 31,466 | 32,084 | 29,236
Rental Expenses: Total | $ 317,001 | $ 321,431 | $ 309,313
Rental Expenses: % Of Grand Totals | 34.41% | 35.54% | 35.78%
Net operating Income | $ 459,960 | $ 445,662 | $ 454,517
Net operating Income: % of Grand Totals | 28.73% | 28.50% | 30.16%
New York [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Rental Revenue: Class A Office | $ 1,012,518 | $ 1,000,030 | $ 928,692
Rental Revenue: Residential | 0 | 0 | 0
Rental Revenue: Hotel | 0 | 0 | 0
Rental Revenue Total | $ 1,012,518 | $ 1,000,030 | $ 928,692
Rental Revenue: % of Grand Totals | 40.14% | 40.52% | 39.16%
Rental Expenses: Class A Office | $ 363,188 | $ 346,897 | $ 315,330
Rental Expenses: Residential | 0 | 0 | 0
Rental Expenses: Hotel | 0 | 0 | 0
Rental Expenses: Total | $ 363,188 | $ 346,897 | $ 315,330
Rental Expenses: % Of Grand Totals | 39.42% | 38.36% | 36.47%
Net operating Income | $ 649,330 | $ 653,133 | $ 613,362
Net operating Income: % of Grand Totals | 40.55% | 41.76% | 40.70%
San Francisco [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Rental Revenue: Class A Office | $ 318,609 | $ 302,434 | $ 261,221
Rental Revenue: Residential | 0 | 0 | 0
Rental Revenue: Hotel | 0 | 0 | 0
Rental Revenue Total | $ 318,609 | $ 302,434 | $ 261,221
Rental Revenue: % of Grand Totals | 12.63% | 12.25% | 11.01%
Rental Expenses: Class A Office | $ 100,787 | $ 98,206 | $ 90,133
Rental Expenses: Residential | 0 | 0 | 0
Rental Expenses: Hotel | 0 | 0 | 0
Rental Expenses: Total | $ 100,787 | $ 98,206 | $ 90,133
Rental Expenses: % Of Grand Totals | 10.94% | 10.86% | 10.43%
Net operating Income | $ 217,822 | $ 204,228 | $ 171,088
Net operating Income: % of Grand Totals | 13.60% | 13.06% | 11.35%
Washington, DC [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Rental Revenue: Class A Office | $ 402,561 | $ 384,628 | $ 396,274
Rental Revenue: Residential | 11,887 | 14,082 | 21,665
Rental Revenue: Hotel | 0 | 0 | 0
Rental Revenue Total | $ 414,448 | $ 398,710 | $ 417,939
Rental Revenue: % of Grand Totals | 16.43% | 16.15% | 17.62%
Rental Expenses: Class A Office | $ 135,890 | $ 131,581 | $ 135,785
Rental Expenses: Residential | 4,368 | 6,221 | 13,965
Rental Expenses: Hotel | 0 | 0 | 0
Rental Expenses: Total | $ 140,258 | $ 137,802 | $ 149,750
Rental Expenses: % Of Grand Totals | 15.23% | 15.24% | 17.32%
Net operating Income | $ 274,190 | $ 260,908 | $ 268,189
Net operating Income: % of Grand Totals | 17.12% | 16.68% | 17.79%

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