Fair Value of Assets and Liabilities (Details 3) (Properties held for sale for which we recognized impairment losses, Purchase Offers, Level 3, USD $) In Thousands, unless otherwise specified	Mar. 31, 2013
Properties held for sale for which we recognized impairment losses \| Purchase Offers \| Level 3
Fair Value of Assets and Liabilities
Fair value of assets	$ 25,750

This element represents the aggregate of the assets reported on the balance sheet at period end measured at fair value by the entity. This element is intended to be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements.

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=7578670&loc=d3e19207-110258

Name:	us-gaap_AssetsFairValueDisclosure
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant