Accrued Liabilities (Details) (USD $) In Thousands, unless otherwise specified	Apr. 01, 2014	Dec. 31, 2013
Components of accrued liabilities
Payroll and vacation	$ 18,519	$ 16,634
Accrued payroll taxes	5,354	2,453
Accrued purchase price due to sellers	0	10,895
Sales tax payable	5,366	6,379
Other	16,644	14,138
Total Accrued liabilities	$ 45,883	$ 50,499

Carrying value as of the balance sheet date of obligations incurred and payable for statutory payroll taxes incurred through that date and withheld from employees pertaining to services received from them, including entity's matching share of the employees FICA taxes and contributions to the state and federal unemployment insurance programs. 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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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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- Definition

Carrying value as of the balance sheet date of liabilities incurred through that date and payable for statutory sales and use taxes, including value added tax. 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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