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Equity-Method Investment And Other Assets Equity-Method Investment And Other Assets (Narrative) (Details) $ in Thousands | Dec. 31, 2017 properties | Dec. 31, 2016 USD ($)
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Investment [Line Items] |  |
Available-for-sale Securities, Accumulated Gross Unrealized Gain (Loss), before Tax | $ |  | $ 10,065
Number of Real Estate Properties | properties | 209 |

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- Definition Line items represent reporting 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 Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Article 12 -Section 12 -Sentence Column A + Details
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- Definition Amount before tax of unrealized gain (loss) in accumulated other comprehensive income (AOCI) on investments in debt and equity securities classified as available-for-sale. + References No definition available. + Details
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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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