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Valuation and Qualifying Accounts (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Allowance for doubtful accounts receivable      
Deducted from asset accounts:      
Balance at Beginning of Period $ 640 $ 857 $ 1,197
Charged to Costs and Expenses 271 84 (34)
Charged to Other Accounts 0 0 0
Deduction 295 301 306
Balance at End of Period 616 640 857
Inventory reserves and obsolescence      
Deducted from asset accounts:      
Balance at Beginning of Period 13,176 14,407 7,869
Charged to Costs and Expenses 3,341 3,521 10,564
Charged to Other Accounts 0 0 0
Deduction 4,491 4,752 4,026
Balance at End of Period $ 12,026 $ 13,176 $ 14,407