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Inventories (Allowance) (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017
Inventory Valuation Reserves [Roll Forward] |  |  |  |
Balance, beginning of period | $ 1,407 | $ 1,642 | $ 1,118 | $ 1,382
Provisions for excess and obsolete inventories | (263) | (206) | 55 | 54
Inventories written off | (30) | (243) | (59) | (243)
Balance, end of period | $ 1,114 | $ 1,193 | $ 1,114 | $ 1,193

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