Derivative Financial Instruments (Details Textual) (USD $) In Millions	1 Months Ended	6 Months Ended
	Mar. 31, 2010	Jun. 30, 2011	Jun. 30, 2010	Jun. 30, 2011 Intangible and other long-term assets [Member]	Dec. 31, 2010 Intangible and other long-term assets [Member]
Derivative Financial Instruments (Textuals) [Abstract]
Derivative asset				$ 0.9	$ 0.2
Amount of debt converted from fixed rate to floating rate	150
Interest income (expense) related to the ineffectiveness associated with the fair value hedge		$ 0.7	$ 0.4