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Real Estate (Dispositions) (Details) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2017 USD ($) property | Dec. 31, 2016 USD ($) property | Dec. 31, 2015 USD ($) property
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |
Income tax expense | $ 0 | $ 0 | $ (10,318)
Assets Held-for-sale |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |
Number of properties sold at a gain | property | 48 | 38 | 19
Gain | $ 36,655 | $ 27,182 | $ 10,807
Income tax expense | 0 | 0 | (357)
Gain on disposition of assets, total, continuing and discontinued operations | $ 36,655 | $ 27,182 | $ 10,450

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- Definition Amount of gain (loss) on sale or disposal of property, plant and equipment assets, excluding oil and gas property and timber property. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 205 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=64827811&loc=d3e1361-107760 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=84176398&loc=d3e2941-110230 + Details
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