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Income Tax Expense (Narrative) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended			12 Months Ended
	Dec. 31, 2009	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2011 Maximum [Member]	Dec. 31, 2011 Minimum [Member]
Uncertain tax positions, net accrued interest	$ 50	$ 45	$ 50
Uncertain tax positions decrease in accrued interest	(250)
Unrecognized tax benefits that would impact effective tax rate		$ 600
Foreign and United States jurisdictions, period of statutes of limitations, years				5	3

This element represents the amount of interest expense accrued as of the date of the statement of financial position for an underpayment of income taxes computed by applying the applicable statutory rate of interest to the difference between a tax position recognized for financial reporting purposes and the amount previously taken or expected to be taken in a tax return of the entity.

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- Definition

This element represents interest expense recognized for an underpayment of income taxes computed by applying the applicable statutory rate of interest to the difference between a tax position recognized for financial reporting purposes and the amount previously taken or expected to be taken in a tax return of the entity.

+ References+ Details