Annual report pursuant to Section 13 and 15(d)

Schedule II - Valuation and Qualifying Accounts (Details)

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Schedule II - Valuation and Qualifying Accounts (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Allowance for Doubtful Accounts      
Movement in Valuation Allowances and Reserves      
Balance at the Beginning of Period $ 1,486 $ 960 $ 602
Additions Charged to Cost and Expense 2,144 589 87
Write-Offs/Other (71) (63) 271
Balance at End of Period 3,559 1,486 960
Reserve for Inventory Valuation      
Movement in Valuation Allowances and Reserves      
Balance at the Beginning of Period 20,826 18,013 15,410
Additions Charged to Cost and Expense 14,803 2,682 2,885
Write-Offs/Other (2,023) 131 (282)
Balance at End of Period 33,606 20,826 18,013
Deferred Tax Valuation Allowance      
Movement in Valuation Allowances and Reserves      
Balance at the Beginning of Period 8,098 7,823 3,816
Additions Charged to Cost and Expense 5,205 275 4,007
Write-Offs/Other 0 0 0
Balance at End of Period $ 13,303 $ 8,098 $ 7,823