Summary of Significant Accounting Policies (Details Textuals) (USD $) In Millions, unless otherwise specified	3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2011	Dec. 31, 2012
Summary of Significant Accounting Policies (Textuals) [Abstract]
Amortization expense	$ 1.9	$ 1.7	$ 3.7	$ 3.2
Future Amortization Expense Current Year					7.2
Aggregate amortization expense for 2013	5.9		5.9
Aggregate amortization expense for 2014	5.8		5.8
Aggregate amortization expense for 2015	5.1		5.1
Aggregate amortization expense for 2016	4.9		4.9
Aggregate amortization expense for 2017	4.7		4.7
Purchased intangible amortization, net of tax	1.1	1.0	2.3	1.8
Amortization expense associated with capitalized software	3.4	2.6	6.7	4.7
Standard Warranty Period	one		one
Share - based compensation expense	$ 2.7	$ 2.5	$ 6.0	$ 5.7