Segment Reporting (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012
Net Revenues by Segment
Total net revenues	$ 59,171	$ 63,699	$ 118,904	$ 124,850
Total net revenues	100.00%	100.00%	100.00%	100.00%
Standard Products [Member]
Net Revenues by Segment
Total net revenues	57,319	61,204	115,284	120,003
Total net revenues	97.00%	96.00%	97.00%	96.00%
Other Products [Member]
Net Revenues by Segment
Total net revenues	$ 1,852	$ 2,495	$ 3,620	$ 4,847
Total net revenues	3.00%	4.00%	3.00%	4.00%