Segment Information (Revenue and Long-term Assets by Geographic Location) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013	Dec. 31, 2013
Geographical [Line Items]
Total sales	$ 63,258	$ 59,301
Total sales, % Inc/Decr	6.70%
Inventory, Gross	83,829		82,690
Domestic [Member]
Geographical [Line Items]
Long-Lived Assets	141,499		139,406
Accumulated Amortization and Depreciation Long Lived Assets	(77,162)		(73,876)
Total sales	41,608	38,965
Total sales, % Inc/Decr	6.80%
long lived assets, net	64,337		65,530
Inventory, Gross	57,854		56,960
International [Member]
Geographical [Line Items]
Long-Lived Assets	43,183		41,857
Accumulated Amortization and Depreciation Long Lived Assets	(14,818)		(13,588)
Total sales	21,650	20,336
Total sales, % Inc/Decr	6.50%
long lived assets, net	28,365		28,269
Inventory, Gross	$ 25,975		$ 25,730