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Summary of Significant Accounting Policies (Intangible Assets) (Details) - Favorable Lease Rates | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016
Finite-Lived Intangible Assets [Line Items] |  |
Favorable lease rates, original useful lives | 38 years | 31 years 4 months 24 days
Minimum |  |
Finite-Lived Intangible Assets [Line Items] |  |
Favorable lease rates, original useful lives | 41 years |
Maximum |  |
Finite-Lived Intangible Assets [Line Items] |  |
Favorable lease rates, original useful lives | 52 years |

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- Definition Useful life of finite-lived intangible assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References No definition available. + Details
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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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