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Summary of Significant Accounting Policies - Properties in Development (Details) - USD ($) | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Property, Plant and Equipment [Line Items] |  |  |
Document Fiscal Year Focus | 2018 |  |
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Carrying Costs | $ 630,202,000 |  |
Other Cost and Expense, Operating | 1,900,000 | $ 1,500,000 | $ 1,500,000
Refundable deposits - development |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Carrying Costs | 550,000 | 3,500,000 |
Parent Company [Member] |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Land | 4,205,445,000 | 4,235,032,000 |
Land Improvements | 613,847,000 | 556,140,000 |
Buildings | 5,088,102,000 | 4,999,378,000 |
Building improvements | 901,596,000 | 787,880,000 |
Development in Process | 54,172,000 | 314,391,000 |
Real Estate Investment Property, at Cost | $ 10,863,162,000 | $ 10,892,821,000 |

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- Definition The current amount of expenditures for a real estate project that has not yet been completed. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03.10) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 + Details
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