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Components of Net Periodic Pension Cost (Narrative) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended	12 Months Ended
	Mar. 31, 2013	Dec. 31, 2012
Components of Net Periodic Pension Cost [Abstract]
Defined Contribution Plan, Employer Discretionary Contribution Amount	$ 450
Minimum amount to be funded as required by the Pension Relief Act Fifteen Year amortization of the Shortfall Amortization Base	$ 450	$ 300

X

- Definition

MinimumAmountToBeFundedAsRequiredByPensionReliefActFifteenYearAmortizationOfShortgallAmortizationBase

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- Definition

Amount of discretionary contributions made by an employer to a defined contribution plan.

+ References

No definition available.

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Period Type:	duration

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