Fair Value of Assets and Liabilities (Details 2) (Properties held for sale for which we recognized impairment losses, Discounted cash flows, Level 3, USD $) In Thousands, unless otherwise specified	12 Months Ended
Dec. 31, 2013
Fair Value of Assets and Liabilities
Fair value of assets	$ 471,457
Minimum
Valuation techniques and significant unobservable inputs
Discount rate (as a percent)	9.00%
Exit capitalization rate (as a percent)	8.00%
Maximum
Valuation techniques and significant unobservable inputs
Discount rate (as a percent)	12.00%
Exit capitalization rate (as a percent)	10.00%
(Weighted Average)
Valuation techniques and significant unobservable inputs
Discount rate (as a percent)	10.30%
Exit capitalization rate (as a percent)	8.80%

Represents information pertaining to exit capitalization rate used as an input to measure fair value.

No definition available.

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- Definition

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=25499696&loc=d3e19207-110258

+ Details

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- Definition

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=25499696&loc=d3e19207-110258

+ Details

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