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Real Estate (Schedule Of Allocation Of The Aggregate Purchase Price Of Acquisition) (Details) - USD ($) $ in Thousands |  |  | 12 Months Ended
--- | --- | --- | ---
May. 31, 2013 | Apr. 10, 2013 | Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |
Real estate and related intangibles recorded upon consolidation |  |  |  | $ 0 | $ 0 | $ 3,356,000
Mortgage notes payable |  |  |  | (3,438,714) | (4,309,484) |
Mezzanine notes payable |  |  |  | (308,482) | (309,796) |
Outside members' notes payable |  |  |  | (180,000) | (180,000) |
Debt recorded upon consolidation |  |  |  | 0 | 0 | (2,056,000)
Cash and cash equivalents |  |  |  |  | 0 | 79,468
Accrued interest payable |  |  |  | (190,386) | (163,532) |
Working capital recorded upon consolidation |  |  |  | 0 | 0 | (177,315)
Noncontrolling interest in property partnerships recorded upon consolidation |  |  |  | $ 0 | $ 0 | $ (480,861)
Mountain View Research And Technology Parks [Member] |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |
Land |  |  | $ 126,521 |  |  |
Building and improvements |  |  | 82,451 |  |  |
Tenant Improvements |  |  | 7,326 |  |  |
In-place lease Intangibles |  |  | 23,279 |  |  |
Above market rents |  |  | 843 |  |  |
Below market rents |  |  | (7,336) |  |  |
Aggregate purchase price |  |  | $ 233,084 |  |  |
767 Fifth Avenue (the General Motors Building) |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |
Land |  | $ 1,796,252 |  |  |  |
Building and improvements |  | 1,447,446 |  |  |  |
Tenant Improvements |  | 85,208 |  |  |  |
In-place lease Intangibles |  | 357,781 |  |  |  |
Above market rents |  | 101,897 |  |  |  |
Below market rents |  | (239,641) |  |  |  |
Above Market Assumed Debt Adjustments |  | (192,943) |  |  |  |
Real estate and related intangibles recorded upon consolidation |  | 3,356,000 |  |  |  |
Mortgage notes payable |  | (1,300,000) |  |  |  |
Mezzanine notes payable |  | (306,000) |  |  |  |
Outside members' notes payable | [1] | (450,000) |  |  |  |
Debt recorded upon consolidation |  | (2,056,000) |  |  |  |
Cash and cash equivalents |  | 79,468 |  |  |  |
Cash held in escrows |  | 2,403 |  |  |  |
Tenant and other receivables |  | 7,104 |  |  |  |
Prepaid expenses and other assets |  | 4,269 |  |  |  |
Accounts payable and accrued expenses |  | (2,418) |  |  |  |
Accrued interest payable | [2] | (182,369) |  |  |  |
Other liabilities |  | (6,304) |  |  |  |
Working capital recorded upon consolidation |  | (97,847) |  |  |  |
Noncontrolling Interest |  | (520,000) |  |  |  |
Noncontrolling Interest working capital |  | 39,139 |  |  |  |
Noncontrolling interest in property partnerships recorded upon consolidation |  | (480,861) |  |  |  |
Net Assets Recorded Upon Consolidation |  | 721,292 |  |  |  |
Consolidation, Eliminations [Member] | 767 Fifth Avenue (the General Motors Building) |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |
Outside members' notes payable |  | (270,000) |  |  |  |
Accrued interest payable |  | $ (105,500) |  |  |  |
[1] | The Company’s member loan totaling $270.0 million eliminates in consolidation.
[2] | The Company’s share of the accrued interest payable on the members’ loans totaling approximately $105.5 million eliminates in consolidation.

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- Definition Amount due from customers or clients for goods or services, including trade receivables, that have been delivered or sold in the normal course of business, and amounts due from others, including related parties expected to be converted to cash, sold or exchanged within one year or the normal operating cycle, if longer, acquired at the acquisition date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=56956791&loc=d3e4845-128472 + Details
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