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Litigation, Commitments and Contingencies Litigation, Commitments And Contingencies (Schedule Of Change In Warranty Liability) (Details) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Commitments and Contingencies Disclosure [Abstract]    
Beginning balance $ 4,853 $ 2,555
Vocollect addition at acquisition 0 948
Payments or parts usage (5,722) (5,867)
Additional provision 8,005 7,217
Ending balance $ 7,136 $ 4,853