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Inventories (Allowance) (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2017 | Jun. 30, 2016 | Jun. 30, 2017 | Jun. 30, 2016
Inventory Valuation Reserves [Roll Forward] |  |  |  |
Balance, beginning of period | $ 1,442 | $ 894 | $ 1,382 | $ 757
Provisions for excess and obsolete inventories | 200 | 171 | 260 | 308
Inventories written off | 0 | 0 | 0 | 0
Balance, end of period | $ 1,642 | $ 1,065 | $ 1,642 | $ 1,065

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