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Gain on Sales of Real Estate (Details) $ in Thousands | 12 Months Ended
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Dec. 31, 2017 USD ($) property | Dec. 31, 2016 USD ($) property | Dec. 31, 2015 USD ($) property
Gain on Sales of Real Estate |  |  |
Property Sales Count | property | 59 | 77 | 38
Proceeds from sales of real estate | $ 166,976 | $ 99,096 | $ 65,817
Gain on sales of properties | $ 40,900 | 22,000 | $ 22,200
Proceeds from sale of former corporate headquarters building |  | $ 8,600 |

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- Definition Number of real estate properties sold during the period. + References No definition available. + Details
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Period Type: | duration

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- References No definition available. + Details
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- Definition The difference between the carrying value and the sale price of real estate or properties that were intended to be sold or held for capital appreciation or rental income. This element refers to the gain (loss) included in earnings and not to the cash proceeds of the sale. This element is a noncash adjustment to net income when calculating net cash generated by operating activities using the indirect method. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3602-108585 + Details
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- Definition The cash inflow from sale of buildings. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 12 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3179-108585 + Details
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- Definition Cash received for the sale of real estate that is not part of an investing activity during the current period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 12 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3179-108585 + Details
Name: | us-gaap_ProceedsFromSaleOfRealEstate
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Balance Type: | debit
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