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Other Financial Statement Information (Details) (USD $)
In Thousands, unless otherwise specified
Jun. 30, 2012
Dec. 31, 2011
Inventories - net    
Finished products $ 42,812 $ 42,382
Work-in-process 9,349 9,196
Raw materials 45,686 46,700
Inventory, Gross 97,847 98,278
Excess of current cost over LIFO cost (5,613) (5,611)
Noncurrent portion of inventory (3,549) (4,054)
Inventory - net $ 88,685 $ 88,613