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Segment Information (Narrative) (Details) $ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2017 USD ($) segment | Dec. 31, 2016 USD ($) | Dec. 31, 2015 | Aug. 21, 2017 USD ($)
Number of segments | segment | 2 |  |  |
Preliminary assets | $ 207,449 | $ 210,457 |  |
Sierra [Member] |  |  |  |
Preliminary assets | $ 77,270 |  |  | $ 80,566
Sales Revenue, Goods, Net [Member] |  |  |  |
Concentration risk, percentage |  |  | 17.00% |
Sales Revenue, Goods, Net [Member] | Customer Concentration Risk [Member] |  |  |  |
Concentration risk, percentage | 14.00% | 16.00% | 17.00% |

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