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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
Allowance for doubtful accounts      
Valuation and qualifying accounts      
Balance at Beginning of Year $ 895 $ 1,142 $ 929
Charged to Costs and Expenses 66 (83) 440
Valuation Allowances and Reserves, Charged to Other Accounts 0 0
Deductions (35) 164 227
Balance at End of Year 996 895 1,142
Allowance for sales discounts      
Valuation and qualifying accounts      
Balance at Beginning of Year 3,050 2,706 2,089
Charged to Costs and Expenses (94) 344 617
Valuation Allowances and Reserves, Charged to Other Accounts 0 0 0
Balance at End of Year 2,956 3,050 2,706
Allowance for deferred tax assets      
Valuation and qualifying accounts      
Balance at Beginning of Year 6,868 7,575 6,754
Charged to Costs and Expenses 5,765 358 1,577
Valuation Allowances and Reserves, Charged to Other Accounts 0 0
Deductions 1,519 1,065 756
Balance at End of Year $ 11,114 $ 6,868 $ 7,575