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Summary of Significant Accounting Policies - Rental Property (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Accounting Policies [Abstract] |  |  |
Payroll and related costs capitalized | $ 1,521 | $ 2,345 | $ 2,095
Interest costs capitalized | $ 93 | 2,289 | 2,259
Buildings and improvements, estimated useful life | 33 years |  |
Land improvements, estimated useful life | 15 years |  |
Property, plant and equipment, estimated useful life, minimum | 7 years |  |
Depreciation expense related to rental property | $ 114,198 | $ 107,845 | $ 96,813
Purchase price allocated to assets, useful life, maximum | 33 years |  |

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- Definition Internal Development Costs, Captialized + References No definition available. + Details
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- Definition Land Improvements Useful Life + References No definition available. + Details
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- Definition Purchase Price Allocated to Assets, Useful Life, Maximum + References No definition available. + Details
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- Definition Real Estate Depreciation + References No definition available. + Details
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- Definition Amount of interest capitalized, including amount of allowance for funds used during construction. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 980 -SubTopic 835 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6501662&loc=d3e56162-110433 + Details
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- Definition Useful life of long lived, physical assets used in the normal conduct of business and not intended for resale, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. Examples include, but not limited to, land, buildings, machinery and equipment, office equipment, furniture and fixtures, and computer equipment. + References No definition available. + Details
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