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.

- Definition

Description of the terms and benefits provided by the employer's defined contribution plans. A defined contribution plan provides benefits in return for services rendered, provides an individual account for each participant, and has terms that specify how contributions to the individual's account are to be determined rather than the amount of benefits the individual is to receive. Under a defined contribution pension plan, the benefits a participant will receive depend solely on the amount contributed to the participant's account, the returns earned on investments of those contributions, and forfeitures of other participants' benefits that may be allocated to such participant's account. A description of the plan(s) including employee groups covered, the basis for determining contributions, and the nature and effects of significant matters affecting comparability of information for all periods presented.

+ References+ Details