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Reportable Segments - Reconciliation of NOI from Rental Real Estate Specific to Continuing Operations (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2017 | Jun. 30, 2016 | Jun. 30, 2017 | Jun. 30, 2016
Segment Reporting Reconciling Item For Operating Profit Loss From Segment To Consolidated [Line Items] |  |  |  |
Rental income | $ 612,299 | $ 594,939 | $ 1,216,219 | $ 1,211,104
Property and maintenance expense | (99,316) | (96,307) | (201,924) | (205,472)
Real estate taxes and insurance expense | (87,503) | (77,415) | (169,231) | (157,611)
Operating income | 210,550 | 206,018 | 414,921 | 422,643
Same Store, Non-same Store and Other |  |  |  |
Segment Reporting Reconciling Item For Operating Profit Loss From Segment To Consolidated [Line Items] |  |  |  |
Rental income | 612,299 | 594,939 | 1,216,219 | 1,211,104
Property and maintenance expense | (99,316) | (96,307) | (201,924) | (205,472)
Real estate taxes and insurance expense | (87,503) | (77,415) | (169,231) | (157,611)
Total operating expenses | (186,819) | (173,722) | (371,155) | (363,083)
Operating income | $ 425,480 | $ 421,217 | $ 845,064 | $ 848,021

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- Definition The aggregate costs of keeping the property in good condition but that do not appreciably prolong the life or increase the value of the property. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.2) -URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688 + Details
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- Definition The total amount of revenue recognized for the period from operating leases, including minimum lease revenue, contingent revenue, percentage revenue and sublease revenue. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 20 -Section 25 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=77902458&loc=d3e39896-112707 + Details
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- Definition The aggregate total of real estate taxes and insurance expense. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.6) -URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 720 -SubTopic 30 -Section 45 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=6419918&loc=d3e35301-107843 + Details
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