Segment Reporting by Geographic Area (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended								12 Months Ended
	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Revenues from External Customers and Long-Lived Assets [Line Items]
Net sales	$ 65,738	$ 68,235	$ 68,317	$ 67,213	$ 64,505	$ 67,863	$ 69,830	$ 71,364	$ 269,503	$ 273,562	$ 300,399
Long-lived assets	58,974				66,981				58,974	66,981		52,672
United States
Revenues from External Customers and Long-Lived Assets [Line Items]
Net sales									241,115	245,196	270,511
Long-lived assets	56,162				63,730				56,162	63,730		49,323
Canada
Revenues from External Customers and Long-Lived Assets [Line Items]
Net sales									28,388	28,366	29,888
Long-lived assets	$ 2,812				$ 3,251				$ 2,812	$ 3,251		$ 3,349