Summary of Significant Accounting Policies - Principles of Consolidation and Investment in Unconsolidated Entities (Details) - Unconsolidated Entities [Member]	12 Months Ended
Dec. 31, 2016
Schedule of Equity Method Investments [Line Items]
Recovery term in excess of which declines in value are considered other than temporary	12 months
Equity Method Investment, Ownership Percentage	50.00%
Equity method investment, ownership percentage threshold	50.00%
Term basis for investment in unconsolidated entities depreciation	40 years

Equity Method Investment, Ownership Percentage Threshold

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- Definition

Recovery term in excess of which declines in value are considered other than temporary

+ References

No definition available.

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- Definition

Term Basis for Investment in Unconsolidated Entities Depreciation

+ References

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- Definition

The percentage of ownership of common stock or equity participation in the investee accounted for under the equity method of accounting.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 323
-SubTopic 10
-Section 50
-Paragraph 3
-Subparagraph (a)(1)
-URI http://asc.fasb.org/extlink&oid=66011266&loc=d3e33918-111571

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

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