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Schedule III-Real Estate and Accumulated Depreciation - Additional Information (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Changes in total real estate assets
Balances, beginning of year	$ 10,689,656	$ 12,777,882	$ 9,181,338
Additions	254,604	392,575	4,042,409
Dispositions and retirements	(1,735,049)	(2,480,801)	(445,865)
Balances, end of year	9,209,211	10,689,656	12,777,882
Aggregate gross cost of the property for federal income tax purposes	6,079,675
Changes in accumulated depreciation
Balances, beginning of year	1,892,744	1,709,992	1,559,572
Additions	277,270	354,977	289,178
Dispositions and retirements	(318,113)	(172,225)	(138,758)
Balances, end of year	$ 1,851,901	$ 1,892,744	$ 1,709,992
Buildings and improvements | Minimum
REAL ESTATE AND ACCUMULATED DEPRECIATION
Estimated useful lives of assets	5 years
Buildings and improvements | Maximum
REAL ESTATE AND ACCUMULATED DEPRECIATION
Estimated useful lives of assets	40 years
Tenant improvements | Minimum
REAL ESTATE AND ACCUMULATED DEPRECIATION
Estimated useful lives of assets	5 years
Tenant improvements | Maximum
REAL ESTATE AND ACCUMULATED DEPRECIATION
Estimated useful lives of assets	7 years
Equipment and furnishings | Minimum
REAL ESTATE AND ACCUMULATED DEPRECIATION
Estimated useful lives of assets	5 years
Equipment and furnishings | Maximum
REAL ESTATE AND ACCUMULATED DEPRECIATION
Estimated useful lives of assets	7 years

X

- Definition

Amount of depreciation expense and other additions to accumulated depreciation for the period.

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The amount that was removed from accumulated depreciation pertaining to real estate that was sold or retired in the period.

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Amount of accumulated depreciation pertaining to real estate investments for entities with a substantial portion of business acquiring and holding investment real estate.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 970
-SubTopic 360
-Section S99
-Paragraph 1
-Subparagraph (SX 210.12-28.FN4)
-URI http://asc.fasb.org/extlink&oid=6590653&loc=d3e638233-123024

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-Topic 205
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Useful life on which depreciation was computed for entities with a substantial portion of business acquiring and holding investment real estate, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
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Cost basis of real estate investments for federal income tax purposes for entities with a substantial portion of business acquiring and holding investment real estate.

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Amount, before accumulated depreciation, of real estate investments for entities with a substantial portion of business acquiring and holding investment real estate.

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