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Summary of Significant Accounting Policies - Revenue Recognition (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017
Accounting Policies [Abstract] |  |
Straight-line rent adjustments recorded as a receivable | $ 57.5 | $ 51.9

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- References No definition available. + Details
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Data Type: | xbrli:stringItemType
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- Definition Amount of the adjustment to rental revenues to measure escalating leasing revenues on a straight line basis. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
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