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Summary of Significant Accounting Policies (Narrative) (Details) | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2018 USD ($) segment | Mar. 31, 2017 USD ($) | Dec. 31, 2017 USD ($)
Summary Of Significant Accounting Policies [Line Items] |  |  |
Period in which short-term investment become cash equivalents | 90 days |  |
Interest capitalized | $ 7,400,000 | $ 4,600,000 |
Compensation costs, leasing and construction activities | 18,300,000 | 18,700,000 |
Cash flows from capitalized leasing costs | 2,300,000 | 3,200,000 |
Impact of Change in Foreign Exchange Rates | 15,515,000 |  |
Unrecognized tax benefits | 0 |  | $ 0
Income tax penalties and interest expense | $ 0 | 0 |
Revenue recognized from applying Topic 840 | 97.00% |  |
Revenue recognized from applying Topic 606 | 3.00% |  |
Gross proceeds | $ 139,300,000 |  |
Gain on sale of property | $ 39,400,000 |  |
Number of reportable segments | segment | 1 |  |
Total operating revenues | $ 744,368,000 | $ 550,569,000 |
Net investments in real estate | $ 14,089,926,000 |  | $ 13,841,186,000
Sales | Geographic Concentration Risk |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |
Concentration risk | 10.10% | 11.80% |
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 | 12.80% |  |
Outside the United States |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |
Total operating revenues | $ 140,900,000 | $ 121,400,000 |
Net investments in real estate | 3,300,000,000 |  | $ 3,100,000,000
United States |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |
Total operating revenues | 603,500,000 | 429,100,000 |
Net investments in real estate | 10,600,000,000 |  | 10,500,000,000
United Kingdom |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |
Total operating revenues | 75,200,000 | $ 65,200,000 |
Net investments in real estate | $ 1,800,000,000 |  | $ 1,700,000,000

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- Definition For an entity that discloses a concentration risk in relation to quantitative amount, which serves as the "benchmark" (or denominator) in the equation, this concept represents the concentration percentage derived from the division. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 275 -SubTopic 10 -Section 50 -Paragraph 18 -URI http://asc.fasb.org/extlink&oid=84177426&loc=d3e6351-108592 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 20 -URI http://asc.fasb.org/extlink&oid=77997519&loc=d3e13531-108611 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 275 -SubTopic 10 -Section 50 -Paragraph 20 -URI http://asc.fasb.org/extlink&oid=84177426&loc=d3e6404-108592 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 21 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=77997519&loc=d3e13537-108611 + Details
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