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Summary of Significant Accounting Policies (Narrative) (Details) | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Sep. 30, 2018 USD ($) | Sep. 30, 2017 USD ($) | Sep. 30, 2018 USD ($) segment | Sep. 30, 2017 USD ($) | Dec. 31, 2017 USD ($)
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |
Period in which short-term investment become cash equivalents |  |  | 90 days |  |
Interest capitalized | $ 9,700,000 | $ 5,300,000 | $ 25,300,000 | $ 13,700,000 |
Compensation costs, leasing and construction activities | 19,500,000 | 20,800,000 | 55,100,000 | 58,400,000 |
Cash flows from capitalized leasing costs |  |  | 6,400,000 | 11,100,000 |
Impact of Change in Foreign Exchange Rates |  |  | (16,253,000) |  |
Unrecognized tax benefits | 0 |  | 0 |  | $ 0
Income tax penalties and interest expense | $ 0 | 0 | $ 0 | 0 |
Revenue recognized from applying Topic 840 | 97.00% |  |  |  |
Revenue recognized from applying Topic 606 |  |  | 3.00% |  |
Gross proceeds | $ 291,700,000 |  | $ 291,700,000 |  |
Gain on sale of property |  |  | $ 80,400,000 |  |
Number of reportable segments | segment |  |  | 1 |  |
Total operating revenues | 768,924,000 | $ 609,925,000 | $ 2,268,211,000 | $ 1,726,483,000 |
Net investments in real estate | $ 14,225,697,000 |  | $ 14,225,697,000 |  | $ 13,841,186,000
Sales | Geographic Concentration Risk |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |
Concentration risk | 9.40% | 11.50% | 9.80% | 11.70% |
Total long-lived assets |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |
Concentration risk |  |  |  |  | 12.10%
Total long-lived assets | Geographic Concentration Risk |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |
Concentration risk |  |  | 11.60% |  |
Outside the United States |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |
Total operating revenues | $ 139,700,000 | $ 131,700,000 | $ 421,300,000 | $ 380,000,000 |
Net investments in real estate | 3,300,000,000 |  | 3,300,000,000 |  | $ 3,100,000,000
United States |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |
Total operating revenues | 629,300,000 | 478,200,000 | 1,800,000,000 | 1,300,000,000 |
Net investments in real estate | 10,800,000,000 |  | 10,800,000,000 |  | 10,500,000,000
United Kingdom |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |
Total operating revenues | 72,600,000 | $ 70,100,000 | 221,900,000 | $ 202,800,000 |
Net investments in real estate | $ 1,600,000,000 |  | $ 1,600,000,000 |  | $ 1,700,000,000

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