Supplemental Balance Sheet Information (Accounts Payable And Accrued Liabilities) (Details) (USD $) In Thousands	Jun. 30, 2011	Dec. 31, 2010
Supplemental Balance Sheet Information
Accounts payable	$ 7,252	$ 4,956
Accrued accounts payable	19,920	24,410
Accrued vacation expense	6,897	5,629
Accrued compensation expense	11,671	15,913
Accrued taxes payable	112	529
Accrued interest expense	1,650	1,804
Accrued royalties payable	6,390	5,362
Other accrued operating expenses	5,669	4,330
Accrued rebates payable	6,171	5,899
Current portion of contingent acquisition consideration payable	3,000	8,794
Value added taxes payable	4,076	2,950
Current portion of foreign currency exchange forward contract liability	6,080	1,673
Other	3,147	1,595
Total accounts payable and accrued liabilities	$ 82,035	$ 83,844	[1]

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