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Inventories (Allowance) (Details) (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2014 | Sep. 30, 2013 | Sep. 30, 2014 | Sep. 30, 2013
Inventory Valuation Reserves [Roll Forward] |  |  |  |
Balance, beginning of period | $ 735 | $ 537 | $ 579 | $ 363
Provisions for excess and obsolete inventories | 67 | 267 | 223 | 468
Inventories written off | 0 | 0 | 0 | (27)
Balance, end of period | $ 802 | $ 804 | $ 802 | $ 804

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