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Schedule II Valuation and Qualifying Accounts (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Valuation and Qualifying Accounts Disclosure      
Balance at beginning of year $ 3,108    
Balance at end of year 3,241 $ 3,108  
Allowance for Doubtful Accounts and Returns      
Valuation and Qualifying Accounts Disclosure      
Balance at beginning of year 3,108 3,615 $ 3,936
Charged to costs and expenses 1,602 561 1,087
Reclassification [1] (526) 0 172
Charged to other accounts [2] 111 (19) (159)
Deductions [3] (1,054) (1,049) (1,421)
Balance at end of year 3,241 3,108 3,615
Inventory Reserves      
Valuation and Qualifying Accounts Disclosure      
Balance at beginning of year 3,644 3,540 3,272
Charged to costs and expenses 1,698 1,455 1,728
Charged to other accounts [2] 183 (50) (160)
Deductions [4] (1,418) (1,301) (1,300)
Balance at end of year 4,107 3,644 3,540
Valuation Allowance for Deferred Tax Assets      
Valuation and Qualifying Accounts Disclosure      
Balance at beginning of year 6,865 5,884 5,699
Charged to costs and expenses 1,634 1,295 734
Charged to other accounts [2] 1,192 (314) (549)
Balance at end of year $ 9,691 $ 6,865 $ 5,884
[1] Includes amount reclassified from Allowance for Doubtful Accounts to Other Receivables to properly classify a customer's open receivables balance.
[2] Primarily includes impact from foreign currency fluctuations
[3] Includes accounts determined to be uncollectible and charged against reserves, net of collections on accounts previously charged against reserves.
[4] Includes inventory identified as excess, slow moving or obsolete and charged against reserves.