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Restructuring Charges (Details Textual) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2013
Restructuring Charges (Textual) [Abstract]
Restructuring charges	$ 539
Restructuring Charges (Additional Textual) [Abstract]
Percentage of staff reduced by the Corporation	3.40%
Severance [Member]
Restructuring Charges (Textual) [Abstract]
Restructuring charges	437
Fixed Asset Retirement [Member]
Restructuring Charges (Textual) [Abstract]
Restructuring charges	$ 102

Amount charged against earnings in the period for incurred and estimated costs associated with exit from or disposal of business activities or restructurings pursuant to a duly authorized plan, excluding asset retirement obligations.

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