Annual report pursuant to Section 13 and 15(d)

NATURE OF OPERATIONS AND ACCOUNTING POLICIES Schedule of Inventory Allowance (Details)

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NATURE OF OPERATIONS AND ACCOUNTING POLICIES Schedule of Inventory Allowance (Details) - Inventory Valuation Reserve - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Movement in Valuation Allowances and Reserves [Roll Forward]      
Balance at beginning of period $ 4,821 $ 5,091 $ 5,169
Increases (decreases) to allowance (809) (270) (78)
Balance at end of period $ 4,012 $ 4,821 $ 5,091