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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
Movement in valuation and qualifying accounts      
Balance at Beginning of Year $ 24,692 $ 24,375 $ 21,301
Charged to Costs and Expenses 2,806 2,322 4,207
Deductions 2,181 2,005 1,133
Balance at End of Year 25,317 24,692 24,375
Valuation allowance on foreign tax credit carryforwards
      
Movement in valuation and qualifying accounts      
Balance at Beginning of Year 15,396 16,755 16,983
Deductions 1,820 1,359 228
Balance at End of Year 13,576 15,396 16,755
Valuation allowance on foreign net operating losses
      
Movement in valuation and qualifying accounts      
Balance at Beginning of Year 898 560  
Charged to Costs and Expenses 712 338 560
Balance at End of Year 1,610 898 560
Valuation allowance on state net operating losses
      
Movement in valuation and qualifying accounts      
Balance at Beginning of Year 494    
Charged to Costs and Expenses 632 494  
Balance at End of Year 1,126 494  
Allowance for doubtful accounts
      
Movement in valuation and qualifying accounts      
Balance at Beginning of Year 7,904 7,060 4,318
Charged to Costs and Expenses 1,462 1,490 3,647
Deductions 361 646 905
Balance at End of Year $ 9,005 $ 7,904 $ 7,060