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Segment Information (Details) | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2016 USD ($) | Jun. 30, 2015 USD ($) | Jun. 30, 2016 USD ($) segment | Jun. 30, 2015 USD ($) | Dec. 31, 2015 USD ($)
Segment Reporting [Abstract] |  |  |  |  |
Number of reportable operating segments defined by geographical regions | segment |  |  | 3 |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |  |
Property revenues | $ 319,562,000 | $ 294,101,000 | $ 631,740,000 | $ 574,330,000 |
Net operating income | 223,483,000 | 204,024,000 | 441,171,000 | 397,082,000 |
Depreciation and amortization | (109,673,000) | (113,731,000) | (219,380,000) | (220,638,000) |
Interest expense | (55,568,000) | (50,802,000) | (108,034,000) | (98,348,000) |
Total return swap income | 2,814,000 | 0 | 5,937,000 | 0 |
Management and other fees from affiliates | 2,028,000 | 2,061,000 | 4,052,000 | 4,705,000 |
General and administrative | (9,698,000) | (9,549,000) | (18,880,000) | (20,094,000) |
Merger and integration expenses | 0 | (1,410,000) | 0 | (3,798,000) |
Acquisition and investment related costs | (267,000) | (429,000) | (1,095,000) | (976,000) |
Interest and other income | 9,409,000 | 3,254,000 | 14,617,000 | 7,453,000 |
Gain on sale of real estate and land | 0 | 0 | 20,258,000 | 7,112,000 |
Deferred tax expense on gain on sale of real estate and land | 0 | 0 | (4,279,000) | 0 |
Equity income in co-investments | 14,296,000 | 4,472,000 | 29,364,000 | 8,783,000 |
Gain on remeasurement of co-investment | 0 | 12,652,000 | 0 | 34,014,000 |
Net income | 76,824,000 | 50,542,000 | 163,731,000 | 115,295,000 |
Net reportable operating segment - real estate assets | 10,510,567,000 |  | 10,510,567,000 |  | $ 10,381,577,000
Real estate under development | 157,659,000 |  | 157,659,000 |  | 242,326,000
Co-investments | 1,103,272,000 |  | 1,103,272,000 |  | 1,036,047,000
Real estate held for sale, net | 0 |  | 0 |  | 26,879,000
Cash and cash equivalents, including restricted cash | 215,376,000 |  | 215,376,000 |  | 123,055,000
Marketable securities | 152,263,000 |  | 152,263,000 |  | 137,485,000
Notes and other receivables | 20,448,000 |  | 20,448,000 |  | 19,285,000
Other non-segment assets | 47,106,000 |  | 47,106,000 |  | 38,437,000
Total assets | 12,206,691,000 |  | 12,206,691,000 |  | 12,005,091,000
Reportable Geographical Components [Member] | Southern California [Member] |  |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |  |
Property revenues | 144,772,000 | 131,026,000 | 286,264,000 | 254,481,000 |
Net operating income | 98,934,000 | 87,810,000 | 195,387,000 | 173,340,000 |
Net reportable operating segment - real estate assets | 4,847,701,000 |  | 4,847,701,000 |  | 4,912,264,000
Reportable Geographical Components [Member] | Northern California [Member] |  |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |  |
Property revenues | 115,361,000 | 103,041,000 | 228,094,000 | 201,692,000 |
Net operating income | 83,510,000 | 73,682,000 | 164,221,000 | 143,579,000 |
Net reportable operating segment - real estate assets | 3,866,145,000 |  | 3,866,145,000 |  | 3,749,072,000
Reportable Geographical Components [Member] | Seattle Metro [Member] |  |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |  |
Property revenues | 53,575,000 | 49,826,000 | 105,649,000 | 98,480,000 |
Net operating income | 35,975,000 | 33,674,000 | 71,664,000 | 66,803,000 |
Net reportable operating segment - real estate assets | 1,686,923,000 |  | 1,686,923,000 |  | 1,613,175,000
Segment Reconciling Items [Member] | Other Real Estate Assets [Member] |  |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |  |
Property revenues | 5,854,000 | 10,208,000 | 11,733,000 | 19,677,000 |
Net operating income | 5,064,000 | $ 8,858,000 | 9,899,000 | $ 13,360,000 |
Net reportable operating segment - real estate assets | $ 109,798,000 |  | $ 109,798,000 |  | $ 107,066,000

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- Definition The difference between the carrying value and the sale price of real estate or properties and land that were intended to be sold or held for capital appreciation or rental income. This element refers to the gain (loss) included in earnings and not to the cash proceeds of the sale. This element is a noncash adjustment to net income when calculating net cash generated by operating activities using the indirect method. + References No definition available. + Details
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