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Plant Closure (Details) (USD $)
 3 Months Ended 12 Months Ended 3 Months Ended
Mar. 31, 2013
Dec. 31, 2012
Mar. 31, 2012
Mar. 31, 2013
Facility closing
Dec. 31, 2012
Facility closing
Dec. 31, 2012
Facility closing
Land and building
Mar. 31, 2013
Facility closing
Operating expenses
Plant Closure              
Net book value of the long-lived assets, including land, building and equipment $ 211,010,000 $ 213,452,000 $ 209,460,000   $ 2,800,000 $ 2,700,000  
Impairment loss on assets held and in use       1,000,000      
Net book value of remaining equipments to be sold, transferred or scrapped 577,000 593,000   100,000      
Severance costs       0 3,000,000    
Severance costs paid       77,000 2,400,000    
Severance costs reversed       36,000      
Severance costs accrued         600,000    
Severance costs to be paid in 2013       500,000      
Estimated closure costs       400,000     700,000
Plant closure expenses       23,000 300,000    
Plant closure expenses paid       55,000 200,000    
Plant closure expenses to be paid in 2013       $ 100,000 $ 100,000