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Fair Value Measurements (Details 4) - Fair value measurement on a nonrecurring basis $ in Thousands	3 Months Ended
	Mar. 31, 2017 USD ($)
Significant Unobservable Inputs (Level 3) | Discounted cash flow
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]
Fair Values on Measurement Date	$ 37,604
Significant Unobservable Inputs (Level 3) | Yield analyses
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]
Fair Values on Measurement Date	$ 2,482
Investor yield requirement (percent)	9.00%
Assets held for sale, net
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]
Fair Values on Measurement Date	$ 40,086
Assets held for sale, net | Significant Unobservable Inputs (Level 3)
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]
Fair Values on Measurement Date	$ 40,086
Minimum | Significant Unobservable Inputs (Level 3) | Discounted cash flow
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]
Discount rate (percent)	9.30%
Terminal capitalization rate (percent)	8.30%
Maximum | Significant Unobservable Inputs (Level 3) | Discounted cash flow
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]
Discount rate (percent)	11.30%
Terminal capitalization rate (percent)	11.40%
Weighted Average | Significant Unobservable Inputs (Level 3) | Discounted cash flow
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]
Discount rate (percent)	10.10%
Terminal capitalization rate (percent)	8.60%

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Fair Value Inputs, Investor Yield Requirement

+ References

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Fair value portion of probable future economic benefits obtained or controlled by an entity as a result of past transactions or events.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19207-110258

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Ratio of the net operating income produced by an asset and its capital cost (original prices paid to buy the asset), used as an input to measure fair value.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (bbb)
-URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19207-110258

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Interest rate used to find the present value of an amount to be paid or received in the future as an input to measure fair value. For example, but not limited to, weighted average cost of capital (WACC), cost of capital, cost of equity and cost of debt.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (bbb)
-URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19207-110258

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