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Valuation and Qualifying Accounts (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Allowance for Doubtful Accounts [Member]      
Valuation and Qualifying Accounts Disclosure [Line Items]      
Balance at beginning of period $ 1,823 $ 1,609 $ 2,533
Charged to costs and expenses 349 442 412
Charged to other accounts [1] (68) (164) (233)
Deductions [2] 93 64 1,103
Balance at end of period 2,011 1,823 1,609
Sales Return Accrual [Member]      
Valuation and Qualifying Accounts Disclosure [Line Items]      
Balance at beginning of period 4,047 5,309 3,843
Charged to costs and expenses 3,789 3,490 5,258
Charged to other accounts 0 0 0
Deductions [3] 4,504 4,752 3,792
Balance at end of period 3,332 4,047 5,309
Inventory Reserve [Member]      
Valuation and Qualifying Accounts Disclosure [Line Items]      
Balance at beginning of period 6,641 5,970 6,791
Charged to costs and expenses 5,234 5,563 5,077
Charged to other accounts [1] (135) (499) (644)
Deductions [4] 6,424 4,393 5,254
Balance at end of period $ 5,316 $ 6,641 $ 5,970
[1] Foreign currency translation adjustment
[2] Write-off of bad debts.
[3] Write-off of sales returns.
[4] Disposal of inventory