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Debt - Components of Mortgage Debt (Footnotes) (Details) - Senior Unsecured Revolving Credit Facility |  | 12 Months Ended
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Mar. 08, 2018 | Dec. 31, 2018
Minimum |  |
Participating Mortgage Loans [Line Items] |  |
Debt instrument, basis spread on variable rate | 0.00% |
Maximum |  |
Participating Mortgage Loans [Line Items] |  |
Debt instrument, basis spread on variable rate | 1.50% |
LIBOR | Minimum |  |
Participating Mortgage Loans [Line Items] |  |
Debt instrument, basis spread on variable rate |  | 1.55%
LIBOR | Maximum |  |
Participating Mortgage Loans [Line Items] |  |
Debt instrument, basis spread on variable rate |  | 2.30%
Prime Rate | Minimum |  |
Participating Mortgage Loans [Line Items] |  |
Debt instrument, basis spread on variable rate |  | 0.55%
Prime Rate | Maximum |  |
Participating Mortgage Loans [Line Items] |  |
Debt instrument, basis spread on variable rate |  | 1.30%

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- Definition Percentage points added to the reference rate to compute the variable rate on the debt instrument. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
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Namespace Prefix: |
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Period Type: |

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- Details
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Period Type: |