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SCHEDULE II VALUATION AND QUALIFYING ACCOUNTS (Details) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Allowance for doubtful accounts
      
Schedule II Valuation and qualifying accounts      
Balance at beginning of period $ 11,270 $ 13,088 $ 15,321
Charged to Cost and Expenses 8,754 1,488 4,749
Deductions 4,972 3,306 6,982
Balance at end of period 15,052 11,270 13,088
Allowance for obsolete and slow moving inventory
      
Schedule II Valuation and qualifying accounts      
Balance at beginning of period 14,011 15,945 16,038
Charged to Cost and Expenses 1,005 4,975 2,337
Deductions 3,280 6,909 2,430
Balance at end of period 11,736 14,011 15,945
Allowance for deferred tax assets
      
Schedule II Valuation and qualifying accounts      
Balance at beginning of period 76,056 18,131 20,024
Charged to Cost and Expenses 29,132 70,513 5,122
Deductions 19,134 12,588 7,015
Balance at end of period $ 86,054 $ 76,056 $ 18,131