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Accrued Liabilities (Summary Of Accrued Liabilities) (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2011	Dec. 31, 2010
Accrued Liabilities [Abstract]
Accrued wages, bonuses and commissions	$ 16,971	$ 11,762
Other accrued liabilities	6,510	6,367
Accrued health claims	1,270	1,304
Accrued liabilities, Total	$ 24,751	$ 19,433

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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