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Inventories (Allowance) (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2016 | Sep. 30, 2015 | Sep. 30, 2016 | Sep. 30, 2015
Inventory Valuation Reserves [Roll Forward] |  |  |  |
Balance, beginning of period | $ 1,065 | $ 773 | $ 757 | $ 714
Provisions for excess and obsolete inventories | 112 | (35) | 420 | 24
Inventories written off | 0 | (135) | 0 | (135)
Balance, end of period | $ 1,177 | $ 603 | $ 1,177 | $ 603

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