Asset Disposal And Impairments And Assets Held For Sale (Assets Held For Sale) (Details) (USD $) In Thousands	Sep. 30, 2011	Dec. 31, 2010
Asset Disposal and Impairments and Assets Held for Sale [Line Items]
Assets Held for Sale	$ 1,510	$ 16,719
Construction And Installation [Member]
Asset Disposal and Impairments and Assets Held for Sale [Line Items]
Assets Held for Sale	1,510	14,469
Corporate [Member]
Asset Disposal and Impairments and Assets Held for Sale [Line Items]
Assets Held for Sale		$ 2,250

Long-lived assets that are held for sale apart from normal operations and anticipated to be sold in less than one year.

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 144

-Paragraph 46

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 205

-SubTopic 20

-Section 45

-Paragraph 10

-URI http://asc.fasb.org/extlink&oid=6892542&loc=d3e1107-107759

Name:	us-gaap_AssetsHeldForSaleLongLived
Namespace Prefix:	us-gaap
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant