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Accrued Liabilities (Summary Of Accrued Liabilities) (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011
Accrued Liabilities [Abstract]
Accrued wages, bonuses and commissions	$ 17,875	$ 16,971
Other accrued liabilities	6,724	6,510
Accrued health claims	1,479	1,270
Accrued liabilities, Total	$ 26,078	$ 24,751

Carrying value as of the balance sheet date of obligations incurred through that date and payable arising from transactions not otherwise specified in the taxonomy. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer).

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