Annual and transition report of foreign private issuers pursuant to Section 13 or 15(d)

Retirement Plans and Employee Rights Upon Termination (Details Textual)

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Retirement Plans and Employee Rights Upon Termination (Details Textual) (USD $)
12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Defined Contribution Plan, Maximum Annual Contribution Per Employee, Percent 50.00%    
Defined Contribution Plan, Employer Discretionary Contribution Amount $ 789,000 $ 519,000 $ 219,000
Defined Benefit Plan, Estimated Future Employer Contributions in Next Fiscal Year 1,700,000    
Severance Liabilities 1,100,000    
Defined Benefit Plan, Expected Future Benefit Payments $ 1,400,000    
Description of Defined Contribution Pension and Other Postretirement Plans The Company, at its discretion, makes matching contributions equal to the lesser of $3,000 or 3% of the participant's annual compensation.