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Inventories (Allowance) (Details) - USD ($) $ in Thousands | 3 Months Ended
--- | ---
Mar. 31, 2018 | Mar. 31, 2017
Inventory Valuation Reserves [Roll Forward] |  |
Balance, beginning of period | $ 1,118 | $ 1,382
Provisions for excess and obsolete inventories | 101 | 60
Inventories written off | (10) | 0
Balance, end of period | $ 1,209 | $ 1,442

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