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Accrued Liabilities (Details) (USD $)
In Thousands, unless otherwise specified
Jun. 30, 2013
Dec. 31, 2012
Accrued Liabilities, Current [Abstract]    
Advance payments from customers $ 3,686 $ 2,829
Accrued Group Purchasing Organization (GPO) fees 2,304 2,278
technologylicensepurchaseobigationcurrent 1,500 1,750
Rebates and lease buyouts 3,657 3,179
Taxes payable 1,196 555
Other 1,710 1,397
Total $ 14,053 $ 11,988