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Employee Benefits (Details 4) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Summary of accumulated other comprehensive loss expected to be recognized
Amortization of loss to be recognized in 2013	$ (2,488)	$ (4,047)	$ 771
Plan [Member]
Summary of accumulated other comprehensive loss expected to be recognized
Amortization of prior service cost to be recognized in 2013	(104)
Amortization of loss to be recognized in 2013	630
Supplemental Plan [Member]
Summary of accumulated other comprehensive loss expected to be recognized
Amortization of prior service cost to be recognized in 2013	114
Amortization of loss to be recognized in 2013	$ 515

- Definition

Before tax amount, net of reclassification adjustments, of the benefit improvement costs resulting from a plan amendment that occurred that has not been recognized in net periodic benefit cost.

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