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Inventories (Details) (USD $)
In Thousands, unless otherwise specified
Jun. 30, 2012
Dec. 31, 2011
Inventories    
Raw materials $ 8,017 $ 10,115
Work-in-process 5,874 5,606
Finished products 44,244 49,141
Field inventory 38,954 39,400
Consignment inventory 7,317 7,551
Total 104,406 111,813
Less reserve for obsolescence (25,983) (28,844)
Inventories, net $ 78,423 $ 82,969