Accrued Liabilities (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Payables and Accruals [Abstract]
Salaries, wages and bonuses	$ 20,635us-gaap_AccruedEmployeeBenefitsCurrent	$ 15,509us-gaap_AccruedEmployeeBenefitsCurrent
Warranty	5,913	4,994
State taxes	3,997us-gaap_TaxesPayableCurrent	5,217us-gaap_TaxesPayableCurrent
Other	10,457us-gaap_OtherLiabilitiesCurrent	7,762us-gaap_OtherLiabilitiesCurrent
Accrued liabilities	$ 41,002us-gaap_AccruedLiabilitiesCurrent	$ 33,482us-gaap_AccruedLiabilitiesCurrent

Carrying value as of the balance sheet date of obligations, excluding pension and other postretirement benefits, incurred through that date and payable for perquisites provided to employees pertaining to services received from them. 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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Aggregate carrying amount of current liabilities (due within one year or within the normal operating cycle if longer) not separately disclosed in the balance sheet. Includes costs that are statutory in nature, are incurred on contractual obligations, or accumulate over time and for which invoices have not yet been received or will not be rendered and of liabilities not separately disclosed.

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- Definition

Carrying value as of the balance sheet date of obligations incurred through that date and payable for estimated claims under standard and extended warranty protection rights granted to customers. For classified balance sheets, represents the current portion of the liabilities (due within one year or within the normal operating cycle if longer).

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