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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
Large Market Same Store |  |
Segment Reporting, Asset Reconciling Item [Line Items] |  |
Assets | 4,003,859 | 4,126,885
Secondary Market Same Store |  |
Segment Reporting, Asset Reconciling Item [Line Items] |  |
Assets | 1,718,237 | 1,768,183
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 Sum of the carrying amounts as of the balance sheet date of all assets that are recognized. Assets are probable future economic benefits obtained or controlled by an entity as a result of past transactions or events. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(a)(12)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(11)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 + Details
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