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Acquired Properties - Narrative (Details) $ in Thousands | 12 Months Ended
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Dec. 31, 2017 USD ($) partially_owned_asset | Dec. 31, 2017 partially_owned_asset | Dec. 31, 2017 partially_owned_asset wholly_owned | Dec. 31, 2017 partially_owned_asset acquisition | Dec. 31, 2016 USD ($) Properties
Business Acquisition [Line Items] |  |  |  |  |
Number of businesses acquired | acquisition |  |  |  | 1 |
Gross acquisition price | $ 633,425 |  |  |  |
Transaction costs capitalized during the period | 1,911 |  |  |  | $ 220
Number of real estate properties acquired during the year | Properties |  |  |  |  | 8
Number of retail properties | Properties |  |  |  |  | 71
Revenue not included in related expensed acquisition costs |  |  |  |  | $ 24,260
Property net income not included in related expensed acquisition costs |  |  |  |  | 17,491
Acquisition and transaction costs |  |  |  |  | 1,287
Retail Site [Member] |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Number of businesses acquired |  | 2 | 6 |  |
Gross acquisition price | $ 633,425 |  |  |  | $ 465,177
Number of retail properties | partially_owned_asset | 2 | 2 | 2 | 2 |

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- Definition Number of Real Estate Properties Acquired During the Year + References No definition available. + Details
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- Definition This element represents acquisition-related costs incurred to effect a business combination which costs have been expensed during the period. Such costs include finder's fees; advisory, legal, accounting, valuation, and other professional or consulting fees; general administrative costs, including the costs of maintaining an internal acquisitions department; and may include costs of registering and issuing debt and equity securities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 25 -Paragraph 23 -URI http://asc.fasb.org/extlink&oid=84229725&loc=d3e1043-128460 + Details
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- Definition Amount of consideration transferred, consisting of acquisition-date fair value of assets transferred by the acquirer, liabilities incurred by the acquirer, and equity interest issued by the acquirer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 30 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=6911251&loc=d3e6578-128477 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=35744584&loc=d3e6927-128479 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 30 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=6911251&loc=d3e6613-128477 + Details
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- Definition This element represents the amount of earnings or loss of the acquiree since the acquisition date included in the consolidated income statement for the reporting period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(1) -URI http://asc.fasb.org/extlink&oid=79982066&loc=d3e1392-128463 + Details
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- Definition This element represents the amount of revenue of the acquiree since the acquisition date included in the consolidated income statement for the reporting period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(1) -URI http://asc.fasb.org/extlink&oid=79982066&loc=d3e1392-128463 + Details
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