v2.4.0.6

Commitments and Contingencies (Details Textual) (USD $)	12 Months Ended
	Dec. 31, 2011 CoinvestmentVenture	Dec. 31, 2009	Dec. 31, 2010
Commitments and Contingencies (Textual) [Abstract]
Outstanding performance and surety bonds	$ 27,600,000		$ 38,100,000
Guaranteed Debt	6,900,000
Settlement cost of previous acquisition		13,000,000
Previous acquisition settlement liability	7,800,000
Number of unconsolidated co-investment venture	1
Potential future legal settlement	600,000
Total damages	$ 200,000,000
Maximum [Member]
Operating Leased Assets [Line Items]
Operating leases lease term	61 years
Minimum [Member]
Operating Leased Assets [Line Items]
Operating leases lease term	1 year

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Guaranteed Debt

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Number of unconsolidated co-investment venture.

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Operating leases lease term.

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Outstanding performance and surety bonds.

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Potential future legal settlement.

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Previous acquisition settlement liability.

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Settlement cost of previous acquisition.

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The value (monetary amount) of the award the plaintiff seeks in the legal matter.

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 450

-SubTopic 20

-Section 50

-Paragraph 1

-URI http://asc.fasb.org/extlink&oid=6952336&loc=d3e14326-108349



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-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 5

-Paragraph 9

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009.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 4: http://www.xbrl.org/2003/role/presentationRef

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-Name Statement of Financial Accounting Standard (FAS)

-Number 5

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-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009.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 6: http://www.xbrl.org/2003/role/presentationRef

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-Name Statement of Financial Accounting Standard (FAS)

-Number 5

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-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.



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-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 5

-Paragraph 12

-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.

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