Segment Reporting (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011
Net Revenues by Segment
Total net revenues	$ 62,928	$ 64,244	$ 187,778	$ 200,248
Total net revenues	100.00%	100.00%	100.00%	100.00%
Standard Products [Member]
Net Revenues by Segment
Total net revenues	60,753	61,907	180,756	193,286
Total net revenues	97.00%	96.00%	96.00%	97.00%
Other Products [Member]
Net Revenues by Segment
Total net revenues	$ 2,175	$ 2,337	$ 7,022	$ 6,962
Total net revenues	3.00%	4.00%	4.00%	3.00%