Accumulated Other Comprehensive Loss (Details Textuals) (USD $)	3 Months Ended		6 Months Ended
	Jun. 30, 2011	Jun. 30, 2010	Jun. 30, 2011	Jun. 30, 2010	Dec. 31, 2010
Accumulated Other Comprehensive Loss (Textuals) [Abstract]
Tax benefit on change in currency translation adjustment	$ 0		$ 0
Tax expense (benefit) on change in unrealized loss on derivative financial instruments	(3,300,000)	(5,000,000)	800,000	(7,300,000)
Tax expense on other changes				700,000
Tax benefit on currency translation adjustment	(200,000)		(200,000)		(200,000)
Tax benefit on unrealized loss on derivative financial instruments	(28,900,000)		(28,900,000)		(21,400,000)
Tax benefit on funded status of pension liability	$ (24,800,000)		$ (24,800,000)		$ (24,800,000)