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Pension Plan (Details) - Unrecognized pension costs in other comprehensive loss (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011
Unrecognized pension costs in other comprehensive loss [Abstract]
Balance at beginning of year	$ 5,852	$ 4,456
Net actuarial loss	993	1,743
Recognized loss	(484)	(347)
Balance at end of year	$ 6,361	$ 5,852

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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