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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      
Charged to Cost and Expense $ 1,610 $ 4,750 $ 5,929
Charged to Other Accounts 0    
Deductions 3,361 6,984 4,325
Balance at Beginning of Period 13,108 15,342 13,738
Balance at End of Period 11,357 13,108 15,342
Inventory Valuation Reserve [Member]
      
Valuation and Qualifying accounts      
Charged to Cost and Expense 4,944 2,246 5,314
Charged to Other Accounts 0    
Deductions 6,373 2,357 3,294
Balance at Beginning of Period 18,257 18,368 16,348
Balance at End of Period 16,828 18,257 18,368
Allowance of Deferred Tax Assets [Member]
      
Valuation and Qualifying accounts      
Charged to Cost and Expense 70,514 5,122 6,952
Charged to Other Accounts 0    
Deductions 12,588 7,015 2,115
Balance at Beginning of Period 18,140 20,033 15,196
Balance at End of Period $ 76,066 $ 18,140 $ 20,033