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Reportable Segments - NOI for Each Segment from Our Rental Real Estate Specific to Continuing Operations (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Dec. 31, 2016
Segment Reporting Information [Line Items]      
Rental income $ 603,920 $ 616,165  
Operating income 204,371 216,625  
Total Assets 20,608,338   $ 20,704,148
Capital Expenditures 39,297    
Same store      
Segment Reporting Information [Line Items]      
Rental income 560,236 545,846  
Operating expenses 167,316 161,004  
Operating income 392,920 384,842  
Total Assets 17,170,075    
Capital Expenditures 37,583    
Non-same store/other      
Segment Reporting Information [Line Items]      
Rental income 43,684 70,319  
Operating expenses 17,020 28,357  
Operating income 26,664 41,962  
Total Assets 3,438,263    
Capital Expenditures 1,714    
Same Store, Non-same Store and Other      
Segment Reporting Information [Line Items]      
Rental income 603,920 616,165  
Operating expenses 184,336 189,361  
Operating income 419,584 426,804  
Other markets | Same store      
Segment Reporting Information [Line Items]      
Rental income 464 437  
Operating expenses 197 152  
Operating income 267 285  
Total Assets 12,818    
Capital Expenditures 20    
Los Angeles | Same store      
Segment Reporting Information [Line Items]      
Rental income 97,182 93,634  
Operating expenses 28,570 27,215  
Operating income 68,612 66,419  
Total Assets 2,663,858    
Capital Expenditures 5,150    
San Diego | Same store      
Segment Reporting Information [Line Items]      
Rental income 22,558 21,471  
Operating expenses 6,062 5,836  
Operating income 16,496 15,635  
Total Assets 468,868    
Capital Expenditures 1,111    
Orange County | Same store      
Segment Reporting Information [Line Items]      
Rental income 21,656 20,522  
Operating expenses 5,471 5,142  
Operating income 16,185 15,380  
Total Assets 334,555    
Capital Expenditures 1,617    
Subtotal - Southern California | Same store      
Segment Reporting Information [Line Items]      
Rental income 141,396 135,627  
Operating expenses 40,103 38,193  
Operating income 101,293 97,434  
Total Assets 3,467,281    
Capital Expenditures 7,878    
New York | Same store      
Segment Reporting Information [Line Items]      
Rental income 114,386 114,038  
Operating expenses 43,060 40,728  
Operating income 71,326 73,310  
Total Assets 4,279,073    
Capital Expenditures 6,713    
Washington DC | Same store      
Segment Reporting Information [Line Items]      
Rental income 106,442 104,294  
Operating expenses 32,332 31,462  
Operating income 74,110 72,832  
Total Assets 3,892,715    
Capital Expenditures 9,006    
San Francisco | Same store      
Segment Reporting Information [Line Items]      
Rental income 94,008 91,361  
Operating expenses 22,753 22,426  
Operating income 71,255 68,935  
Total Assets 2,509,353    
Capital Expenditures 7,163    
Boston | Same store      
Segment Reporting Information [Line Items]      
Rental income 60,142 59,318  
Operating expenses 16,767 16,614  
Operating income 43,375 42,704  
Total Assets 1,823,241    
Capital Expenditures 3,419    
Seattle | Same store      
Segment Reporting Information [Line Items]      
Rental income 43,398 40,771  
Operating expenses 12,104 11,429  
Operating income 31,294 29,342  
Total Assets 1,185,594    
Capital Expenditures 3,384    
Non-same store | Non-same store/other      
Segment Reporting Information [Line Items]      
Rental income 46,112 19,389  
Operating expenses 15,548 7,873  
Operating income 30,564 11,516  
Total Assets 2,368,331    
Capital Expenditures 1,561    
Other | Non-same store/other      
Segment Reporting Information [Line Items]      
Rental income (2,428) 50,930  
Operating expenses 1,472 20,484  
Operating income (3,900) $ 30,446  
Total Assets 1,069,932    
Capital Expenditures $ 153