Other Current Accrued Liabilities (Details) (USD $) In Thousands	Sep. 30, 2011	Dec. 31, 2010
Other Current Accrued Liabilities [Abstract]
Customer prepayments	$ 12,177	$ 11,999
Litigation reserves	6,493	6,493
Deferred compensation & benefit plans	6,605	6,548
Accrued hold back & royalty consideration	2,202	2,132
Other accrued liabilities	6,463	3,376
Total other current accrued liabilities	$ 33,940	$ 30,548