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Accrued Liabilities (Details) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2013
Dec. 31, 2012
Accrued Liabilities, Current [Abstract]    
Advance payments from customers $ 2,555 $ 2,829
Accrued Group Purchasing Organization (GPO) fees 2,431 2,278
technologylicensepurchaseobigationcurrent 1,250 1,750
Rebates and lease buyouts 4,097 3,179
Taxes payable 972 555
Other 1,220 1,397
Total $ 12,525 $ 11,988