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Organization and Operation (Details) ft² in Millions | Dec. 31, 2017 ft² state property
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Organization and Operation |
Properties owned | property | 5,172
Number of U.S. states where properties are owned | state | 49
Leasable square feet | ft² | 89.6

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- Definition Area of a real estate property. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | num:areaItemType
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Period Type: | instant

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- Definition The number of real estate properties owned as of the balance sheet date. + References No definition available. + Details
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- Definition The number of states the entity operates in as of the balance sheet date. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

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