Summary of Significant Accounting Policies (Details Textuals) - USD ($)	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015	Dec. 31, 2015
Deferred Tax Assets, Net of Valuation Allowance, Current	$ 70,039,000		$ 67,483,000
Summary of Significant Accounting Policies (Textuals) [Abstract]
Amortization expense	1,800,000	$ 1,600,000
Future Amortization Expense Current Year	6,800,000
Aggregate amortization expense for 2016	6,500,000
Aggregate amortization expense for 2017	6,200,000
Aggregate amortization expense for 2018	5,900,000
Aggregate amortization expense for 2019	5,600,000
Aggregate amortization expense for 2020	5,300,000
Purchased Intangible Amortization, Gross	1,700,000	1,500,000
Purchased intangible amortization, net of tax	1,100,000	1,000,000
Amortization expense associated with capitalized software	$ 6,600,000	5,900,000
Standard Warranty Period	one
Share - based compensation expense	$ 3,700,000	$ 3,500,000
Unamortized Debt Issuance Expense	(1,794,000)		(1,800)
Deferred Tax Liabilities, Net, Current	$ 22,854,000		$ 22,435,000