Property and Equipment (Details Textual) (USD $) In Millions, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2011
Property and Equipment (Textual) [Abstract]
Total depreciation expense	$ 2.3	$ 2.3	$ 4.6	$ 4.5
Software and development costs [Member]
Property and Equipment (Textual) [Abstract]
Capitalized software development costs	5.3		5.3
Amortization	1.6	1.5	3.0	2.9
Unamortized software development costs			$ 17.3