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Schedule 2-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 receivable
      
Valuation and Qualifying Accounts      
Balance at beginning of year $ 7,250 $ 7,205 $ 6,473
Charged to cost and expenses 11,532 8,746 7,335
Charged (credited) to other accounts (485) (60) (70)
Deductions/Other (8,250) (8,641) (6,533)
Balance at end of year 10,045 7,250 7,205
Inventory allowance
      
Valuation and Qualifying Accounts      
Balance at beginning of year 29,425 23,881 21,168
Charged to cost and expenses 5,463 7,376 8,760
Deductions/Other (5,448) (1,832) (6,047)
Balance at end of year 29,440 29,425 23,881
Deferred tax valuation allowance
      
Valuation and Qualifying Accounts      
Balance at beginning of year 21,023 17,239 14,370
Charged to cost and expenses (1,907) 3,784 2,869
Balance at end of year $ 19,116 $ 21,023 $ 17,239