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SCHEDULE II VALUATION AND QUALIFYING ACCOUNTS (Details) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Allowance for doubtful accounts
      
Valuation and qualifying accounts      
Balance at beginning of period $ 15,011 $ 11,229 $ 12,925
Charged to Cost and Expenses 2,174 8,754 1,488
Deductions 8,580 4,972 3,184
Balance at end of period 8,605 15,011 11,229
Allowance for obsolete and slow moving inventory
      
Valuation and qualifying accounts      
Balance at beginning of period 11,736 14,011 15,945
Charged to Cost and Expenses 4,535 1,005 4,975
Deductions 2,169 3,280 6,909
Balance at end of period 14,102 11,736 14,011
Allowance for deferred tax assets
      
Valuation and qualifying accounts      
Balance at beginning of period 86,054 76,056 18,131
Charged to Cost and Expenses 31,978 29,132 70,513
Deductions 15,614 19,134 12,588
Balance at end of period $ 102,418 $ 86,054 $ 76,056