Segment Information (Revenue and Long-term Assets by Geographic Location) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014	Dec. 31, 2014
Geographical [Line Items]
Total sales	$ 61,493	$ 63,919	$ 122,869	$ 127,177
Total sales, % Inc/Decr	(3.80%)		(3.40%)
Inventory, Gross	$ 88,364		$ 88,364		$ 90,292
Domestic [Member]
Geographical [Line Items]
Long-Lived Assets, Gross	143,779		143,779		144,750
Accumulated Amortization and Depreciation Long Lived Assets	(85,843)		(85,843)		(82,167)
Total sales	$ 41,295	42,199	$ 82,543	83,807
Total sales, % Inc/Decr	(2.10%)		(1.50%)
long lived assets, net	$ 57,936		$ 57,936		62,583
Inventory, Gross	53,049		53,049		57,361
International [Member]
Geographical [Line Items]
Long-Lived Assets, Gross	51,699		51,699		43,648
Accumulated Amortization and Depreciation Long Lived Assets	(16,899)		(16,899)		(15,580)
Total sales	$ 20,198	$ 21,720	$ 40,326	$ 43,370
Total sales, % Inc/Decr	(7.00%)		(7.00%)
long lived assets, net	$ 34,800		$ 34,800		28,068
Inventory, Gross	$ 35,315		$ 35,315		$ 32,931