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Segment Reporting by Geographic Area (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended								12 Months Ended
	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2011	Sep. 30, 2011	Jun. 30, 2011	Mar. 31, 2011	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Revenues from External Customers and Long-Lived Assets [Line Items]
Net sales	$ 68,193	$ 71,984	$ 74,348	$ 75,962	$ 72,860	$ 75,366	$ 84,154	$ 82,579	$ 290,487	$ 314,959	$ 316,780
Long-lived assets	67,155				52,702				67,155	52,702	44,442
United States
Revenues from External Customers and Long-Lived Assets [Line Items]
Net sales									262,121	285,071	288,054
Long-lived assets	63,904				49,353				63,904	49,353	41,006
Canada
Revenues from External Customers and Long-Lived Assets [Line Items]
Net sales									28,366	29,888	28,726
Long-lived assets	$ 3,251				$ 3,349				$ 3,251	$ 3,349	$ 3,436

Amount, net of accumulated depreciation, depletion and amortization, of long-lived physical assets used in the normal conduct of business and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, furniture and fixtures, and computer equipment.

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