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Schedule II - Valuation and Qualifying Accounts (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Inventory Valuation Reserve [Member]      
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items]      
Balance at beginning of period $ 5,349 $ 5,316 $ 6,641
Charged to costs and expenses 4,694 3,300 5,234
Charged to other accounts - describe [1] (183) 570 (135)
Deductions - describe [2] 5,006 3,837 6,424
Balance at end of period 4,854 5,349 5,316
Allowance for Doubtful Accounts [Member]      
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items]      
Balance at beginning of period 1,821 2,011 1,823
Charged to costs and expenses 1,441 843 349
Charged to other accounts - describe [1] (91) 205 (68)
Deductions - describe [3] 569 1,238 93
Balance at end of period 2,602 1,821 2,011
Allowance for Sales Returns [Member]      
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items]      
Balance at beginning of period 3,310 3,332 4,047
Charged to costs and expenses 1,329 3,497 3,789
Charged to other accounts - describe [1]
Deductions - describe [4] 3,260 3,519 4,504
Balance at end of period $ 1,379 $ 3,310 $ 3,332
[1] Foreign currency translation adjustment.
[2] Disposal of inventory.
[3] Write-off of bad debts.
[4] Write-off of sales returns.