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Postretirement Benefits (Postretirement Benefits Accumulated Other Comprehensive Income) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Postretirement Benefits [Abstract]
Accumulated other comprehensive income, beginning of year	$ 201		$ 136
Prior service cost arising during period	(291)
Amortization of prior service cost	16
Net actuarial gain (loss) arising during period	(609)	65
Accumulated other comprehensive income (loss), end of year	$ (683)		$ 136

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The pretax total of net gain (loss), prior service cost (credit), and transition assets (obligations), as well as minimum pension liability if still remaining, included in accumulated other comprehensive income associated with a defined benefit pension or other postretirement plan(s) because they have yet to be recognized as components of net periodic benefit cost.

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The pretax net amount of gains and losses that are not yet recognized as a component of net periodic benefit cost, and that are recognized as increases or decreases in other comprehensive income as they arise. Gains and losses are due to changes in the value of either the benefit obligation or the plan assets resulting from experience different from that assumed or from a change in an actuarial assumption, or the consequence of a decision to temporarily deviate from the substantive plan.

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The change in other comprehensive income due to the amortization of the net prior service costs (credit) into net periodic pension costs.

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