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Summary Of Significant Accounting And Reporting Policies (Narrative) (Details) (USD $)
 12 Months Ended
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Summary Of Significant Accounting And Reporting Policies [Line Items]      
Other-than-temporary equity investment losses     $ 1,290,590
Accumulated amortization 4,630,000 3,597,000  
Weighted average amortization life, in years 8    
Amortization expense 1,063,000 877,000 498,000
Future amortization expense, year 1 1,100,000    
Future amortization expense, year 2 1,100,000    
Future amortization expense, year 3 1,100,000    
Future amortization expense, year 4 1,100,000    
Future amortization expense, year 5 1,100,000    
Advertising and promotional costs 1,179,000 922,000 1,308,000
Repair and maintenance of plant and equipment 11,520,000 8,315,000 5,992,000
Depreciation expense 41,572,000 37,744,000 37,866,000
Shares related to stock plans not included in diluted average common shares outstanding because their effect would be antidilutive 1,253,824 279,333 8,169,888
Allowance for obsolete and slow moving inventories $ 4,893,000 $ 3,997,000  
Buildings And Improvements [Member]
      
Summary Of Significant Accounting And Reporting Policies [Line Items]      
Minimum estimated useful life, in years 7    
Maximum estimated useful life, in years 40    
Machinery And Equipment [Member]
      
Summary Of Significant Accounting And Reporting Policies [Line Items]      
Minimum estimated useful life, in years 3    
Maximum estimated useful life, in years 10