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, 2017
Dec. 31, 2016
Dec. 31, 2015
Allowances for accounts receivable      
Valuation and qualifying accounts      
Beginning Balance $ 2,293 $ 1,668 $ 1,819
Charged to Cost and Expense (178)   (181)
Charged to Cost and Expense   644  
Deductions 13 19 (30)
Ending Balance 2,102 2,293 1,668
Reserve for inventory obsolescence      
Valuation and qualifying accounts      
Beginning Balance 15 16 10
Charged to Cost and Expense   3 13
Deductions 3 4 7
Ending Balance $ 12 $ 15 $ 16