Supplemental Balance Sheet Information (Accounts Payable And Accrued Liabilities) (Details) (USD $) In Thousands	Sep. 30, 2011	Dec. 31, 2010
Supplemental Balance Sheet Information [Abstract]
Accounts payable	$ 7,107	$ 4,956
Accrued accounts payable	18,184	24,410
Accrued vacation expense	6,469	5,629
Accrued compensation expense	18,459	15,913
Accrued taxes payable	159	529
Accrued interest expense	2,864	1,804
Accrued royalties payable	6,481	5,362
Accrued rebates payable	5,980	5,899
Other accrued operating expenses	5,840	4,330
Value added taxes payable	3,678	2,950
Current portion of contingent acquisition consideration payable	5,479	8,794
Current portion of foreign currency exchange forward contract liability	926	1,673
Other	1,628	1,595
Total accounts payable and accrued liabilities	$ 83,254	$ 83,844	[1]

[1] December 31, 2010 balances were derived from the audited consolidated financial statements.