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Accrued Liabilities (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2012
Dec. 31, 2011
Accrued Liabilities, Current [Abstract]    
Rebates and lease buyouts $ 3,179 $ 1,748
Advance payments from customers 2,829 3,390
Accrued Group Purchasing Organization (GPO) fees 2,278 2,437
technologylicensepurchaseobigationcurrent 1,750 0
Taxes payable 555 925
Other 1,397 401
Total $ 11,988 $ 8,901