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SCHEDULE II VALUATION AND QUALIFYING ACCOUNTS AND RESERVES (Details) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Allowance for doubtful accounts receivable and revenue adjustments
      
Changes in valuation and qualifying accounts and reserves      
Balance at Beginning of Period $ 5,249 $ 5,957 $ 3,944
Additions, Charged to Costs and Expenses 2,065 1,524 2,394
Additions, Charged to Other Accounts 39 26 2,667
Deductions 2,820 2,258 3,048
Balance at End of Period 4,533 5,249 5,957
Allowance for other accounts receivable
      
Changes in valuation and qualifying accounts and reserves      
Balance at Beginning of Period 1,334 1,226 1,254
Additions, Charged to Costs and Expenses 88 108 (28)
Balance at End of Period 1,422 1,334 1,226
Allowance for deferred tax assets
      
Changes in valuation and qualifying accounts and reserves      
Balance at Beginning of Period 2,511 5,644 2,455
Additions, Charged to Costs and Expenses 0 791 214
Additions, Charged to Other Accounts 0 47 3,971
Deductions 1,483 3,971 996
Balance at End of Period $ 1,028 $ 2,511 $ 5,644