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Schedule II (Details) (Allowance for Doubtful Accounts and Sales Returns, USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Allowance for Doubtful Accounts and Sales Returns
     
Movement in Valuation Allowances and Reserves [Roll Forward]      
Balance at the Beginning of Year $ 5,003 $ 4,761 $ 5,597
Expenses and Other Costs 1,901 [1] 2,353 [1] 2,776 [1]
Revenue Reductions 2,727 [2] 4,433 [2] 1,635 [2]
Deduction (4,513) [3] (6,544) [3] (5,247) [3]
Balance at End of Year $ 5,118 $ 5,003 $ 4,761
[1] Includes increases in allowance for doubtful accounts.
[2] Includes increases in sales allowance for potential credits issued to customers.
[3] Includes actual write-offs of uncollectible accounts receivable and credits issued for sales adjustments.