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Other Financial Statement Information (Details) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2013
Dec. 31, 2012
Inventories - net    
Finished products $ 40,482 $ 41,474
Work-in-process 8,225 7,940
Raw materials 46,666 46,133
Inventory, gross 95,373 95,547
Excess of current cost over LIFO cost (4,645) (4,674)
Noncurrent portion of inventory (4,420) (3,957)
Inventory - net $ 86,308 $ 86,916