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Segment Information (Assets for Reportable Segments) (Details) - Parent Company [Member] - USD ($) $ in Thousands | Dec. 31, 2017 | Dec. 31, 2016
--- | --- | ---
Segment Reporting, Asset Reconciling Item [Line Items] |  |
Assets | $ 11,491,919 | $ 11,604,491
Same Store [Member] |  |
Segment Reporting, Asset Reconciling Item [Line Items] |  |
Assets | 5,722,096 | 5,895,068
Non Same Store And Other |  |
Segment Reporting, Asset Reconciling Item [Line Items] |  |
Assets | 5,570,003 | 5,479,780
Corporate assets |  |
Segment Reporting, Asset Reconciling Item [Line Items] |  |
Assets | $ 199,820 | $ 229,643

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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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