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Summary of Significant Accounting Policies - Basis of Presentation and Real Estate Properties (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Basis of Presentation
Ownership interest in subsidiaries (as a percent)	100.00%
Assets of taxable REIT subsidiaries	$ 2,879
Liabilities of taxable REIT subsidiaries	950
Real Estate Properties
Increase (decrease) in capitalized above and below market leases rental income	4,060	$ 2,322	$ (3,656)
Amortization of acquired real estate leases and other intangible assets	$ 80,040	$ 38,970	$ 22,718
Furniture and Fixtures [Member] | Real Estate Investment [Member] | Maximum
Real Estate Properties
Estimated useful lives	40 years

X

- Definition

The aggregate expense charged against earnings to allocate the cost of intangible assets (nonphysical assets not used in production) and liabilities in a systematic and rational manner to the periods expected to be impacted from such assets and liabilities. As a noncash expense/ income, this element is added back to/deducted from net income when calculating cash provided by (used in) operations using the indirect method.

+ References

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- Definition

Represents the increase or decrease in rental income associated with capitalized above market and below market lease due to amortization.

+ References

No definition available.

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- Definition

Represents the percentage of ownership held in the subsidiary either directly or indirectly.

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- Definition

Useful life of long lived, physical assets used in the normal conduct of business and not intended for resale, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. Examples include, but not limited to, land, buildings, machinery and equipment, office equipment, furniture and fixtures, and computer equipment.

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- Definition

The carrying amount of the consolidated Variable Interest Entity's assets included in the reporting entity's statement of financial position.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 810
-SubTopic 10
-Section 50
-Paragraph 3
-Subparagraph (bb)
-URI http://asc.fasb.org/extlink&oid=52262685&loc=d3e5710-111685

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- Definition

The carrying amount of the consolidated Variable Interest Entity's liabilities included in the reporting entity's statement of financial position.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 810
-SubTopic 10
-Section 50
-Paragraph 3
-Subparagraph (bb)
-URI http://asc.fasb.org/extlink&oid=52262685&loc=d3e5710-111685

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