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Other Financial Statement Information (Details) (USD $)
In Thousands, unless otherwise specified
Sep. 30, 2012
Dec. 31, 2011
Inventories - net    
Finished products $ 42,849 $ 42,382
Work-in-process 9,005 9,196
Raw materials 46,103 46,700
Inventory, Gross 97,957 98,278
Excess of current cost over LIFO cost (5,815) (5,611)
Noncurrent portion of inventory (4,353) (4,054)
Inventory - net $ 87,789 $ 88,613