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Fair Value Measurements (Details) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2013 Significant Other Observable Inputs (level 2) Recurring basis	Dec. 31, 2012 Significant Other Observable Inputs (level 2) Recurring basis	Mar. 31, 2013 Significant Unobservable Inputs (Level 3) Nonrecurring basis	Mar. 31, 2012 Significant Unobservable Inputs (Level 3) Nonrecurring basis
Summarizes the valuation of interest rate swaps and impaired assets
Interest rate swaps (liability)	$ (8,727)	$ (9,916)
Impaired long-lived assets			1,216	1,800
Impaired long-lived assets-Discontinued operations			$ 273

X

- Definition

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

+ References

No definition available.

+ Details

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- Definition

Long-lived asset impairment fair value disclosure.

+ References

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+ Details

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X

- Definition

Fair value of derivative liability, presented on a gross basis even when the derivative instrument is subject to master netting arrangements and qualifies for net presentation in the statement of financial position.

+ References

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

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 133

-Paragraph 205G

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009.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 Statement of Financial Accounting Standard (FAS)

-Number 133

-Paragraph 44C

-Subparagraph a

-Clause 1

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009.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 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 815

-SubTopic 10

-Section 50

-Paragraph 4B

-Subparagraph (a),(c)

-URI http://asc.fasb.org/extlink&oid=7476318&loc=SL5624163-113959

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