Stock-based Compensation (Details) (USD $)	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Stock-based compensation expense before income taxes	$ 459,000	$ 555,000
Excess income tax benefit from exercises of stock options	53,000	4,000
Total remaining unrecognized compensation cost related to non-vested stock options	4,300,000
Total remaining unrecognized compensation cost related to non-vested stock options, recogniztion period	3 years 0 months 7 days
Stock awards granted	50,000
Risk-free interest rate	0.65%
Expected option life	4 years 2 months 12 days
Expected dividend yield	0.00%
Expected price volatility	40.20%
Cost of Sales [Member]
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Stock-based compensation expense before income taxes	54,000	82,000
Research and Development Expense [Member]
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Stock-based compensation expense before income taxes	25,000	32,000
Selling General And Administrative Stock Based Compensation Expense [Member]
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Stock-based compensation expense before income taxes	$ 380,000	$ 441,000