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SCHEDULE II VALUATION AND QUALIFYING ACCOUNTS (Details) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Allowance for Doubtful Accounts [Member]
      
Valuation and Qualifying Accounts Disclosure [Line Items]      
Balance at Beginning of Period $ 734 $ 734 $ 1,000
Charged To Cost and Expense 0 0 0
Charged to other accounts 0 0 0
Deductions 0 0 (266)
Balance at End of Period 734 734 734
Valuation Allowance of Deferred Tax Assets [Member]
      
Valuation and Qualifying Accounts Disclosure [Line Items]      
Balance at Beginning of Period 714,423 681,094 550,204
Charged To Cost and Expense 0 0 0
Charged to other accounts 59,291 33,329 130,890
Deductions 0 0 0
Balance at End of Period 773,714 714,423 681,094
Inventory Valuation Reserve [Member]
      
Valuation and Qualifying Accounts Disclosure [Line Items]      
Balance at Beginning of Period 8,377 8,715 55,867
Charged To Cost and Expense 19,766 0 0
Charged to other accounts 0 0 0
Deductions 0 (338) (47,152)
Balance at End of Period $ 28,143 $ 8,377 $ 8,715