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Fair Value (Details Textual) (USD $)	3 Months Ended	6 Months Ended
Fair Value (Details Textual) (USD $)	Jun. 30, 2011	Jun. 30, 2011	Dec. 31, 2010
Fair Value (Textuals) [Abstract]
Decrease in fair value of liability related to interest rate swap agreements	$ 11,600,000	$ 11,600,000	$ 3,900,000
After tax adjustment to other comprehensive due to interest rate swap agreement	7,400,000	7,400,000	2,500,000
Impairment charge , after tax	39,562,000	47,930,000
Disposal Group, Including Discontinued Operation, Goodwill Allocated Prior to Impairment	$ 45,300,000	$ 45,300,000

Provision recognizing a loss (after tax benefit) for initial, or subsequent, write-down to fair value (less cost to sell) of a disposal group that is classified as a component of the entity, which remains unsold as of the reporting date. May include the recognition of a (gain) (net of tax expense) for a subsequent increase in fair value (less cost to sell), but not in excess of the cumulative loss previously recognized through write-downs.

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