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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 [Member]
      
Valuation and Qualifying Accounts Disclosure [Line Items]      
Balance at beginning of period $ 6,074 $ 5,320 $ 4,367
Charged to costs and expenses 574 914 2,838
Charged to other accounts 123 [1] 120 [1] (211) [1]
Deductions 4,238 [2] 280 [2] 1,674 [2]
Balance at end of period 2,533 6,074 5,320
Sales Return Accrual [Member]
      
Valuation and Qualifying Accounts Disclosure [Line Items]      
Balance at beginning of period 4,526 4,172 1,560
Charged to costs and expenses 3,751 4,249 4,129
Charged to other accounts         
Deductions 4,434 [3] 3,895 [3] 1,517 [3]
Balance at end of period 3,843 4,526 4,172
Inventory Reserve [Member]
      
Valuation and Qualifying Accounts Disclosure [Line Items]      
Balance at beginning of period 19,923 7,460 6,242
Charged to costs and expenses 6,794 17,957 3,880
Charged to other accounts 323 [1] 449 [1] (272) [1]
Deductions 20,249 [4] 5,943 [4] 2,390 [4]
Balance at end of period $ 6,791 $ 19,923 $ 7,460
[1] Foreign currency translation adjustment
[2] Write-off of bad debts
[3] Write-off of sales returns
[4] Disposal of inventory