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SCHEDULE II VALUATION AND QUALIFYING ACCOUNTS (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Allowance for doubtful accounts      
Valuation and qualifying accounts      
Balance at Beginning of Year $ 1,142 $ 929 $ 945
Charged to Costs and Expenses (83) 440 151
Valuation Allowances and Reserves, Charged to Other Accounts 0 0
Deductions 164 227 167
Balance at End of Year 895 1,142 929
Allowance for sales discounts      
Valuation and qualifying accounts      
Balance at Beginning of Year 2,706 2,089 1,451
Charged to Costs and Expenses 344 617 638
Valuation Allowances and Reserves, Charged to Other Accounts 0 0 0
Balance at End of Year 3,050 2,706 2,089
Allowance for deferred tax assets      
Valuation and qualifying accounts      
Balance at Beginning of Year 7,575 6,754 5,546
Charged to Costs and Expenses 358 1,577 1,397
Valuation Allowances and Reserves, Charged to Other Accounts 0 0
Deductions 1,065 756 189
Balance at End of Year $ 6,868 $ 7,575 $ 6,754