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Condensed Consolidated Statements Of Income (Loss) And Retained Earnings (Parenthetical) (USD $)
3 Months Ended
Mar. 31, 2013
Mar. 31, 2012
Cost of sales, accumulated other comprehensive income reclassifications $ 30,174,023 $ 27,488,126
Selling, general and administrative expenses, accumulated other comprehensive income reclassifications 4,294,005 4,034,426
Gain on sale of equity investments, accumulated other comprehensive income reclassifications 3,069,284 415,530
Income tax expense from reclassification items (750,000) (875,000)
Reclassification Out Of Accumulated Other Comprehensive Income [Member]
   
Income tax expense from reclassification items 1,020,000 168,000
Reclassification Out Of Accumulated Other Comprehensive Income [Member] | Net Periodic Pension And Postretirement [Member]
   
Cost of sales, accumulated other comprehensive income reclassifications 303,453 0
Selling, general and administrative expenses, accumulated other comprehensive income reclassifications 215,326 0
Reclassification Out Of Accumulated Other Comprehensive Income [Member] | Unrealized Net Gains On Available-For-Sale Securities [Member]
   
Gain on sale of equity investments, accumulated other comprehensive income reclassifications $ 3,069,284 $ 415,530