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Goodwill and Other Intangible Assets (Schedule of net other intangible assets) (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Finite-Lived Intangible Assets [Line Items] |  |  |
Original cost | $ 6,457 | $ 6,457 |
Accumulated amortization | 3,533 | 1,293 |
Other intangible assets, Net | 2,924 | 5,164 |
Amortization expense | 2,240 | 1,168 | $ 105
Intellectual property [Member] |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |
Original cost | 200 | 200 |
Accumulated amortization | 200 | 154 |
Other intangible assets, Net |  | 46 |
Useful life | 3 years |  |
Current technology [Member] |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |
Original cost | $ 3,833 | 3,833 |
Accumulated amortization | 1,930 | 654 |
Other intangible assets, Net | $ 1,903 | 3,179 |
Useful life | 3 years |  |
Customer relationships [Member] |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |
Original cost | $ 1,937 | 1,937 |
Accumulated amortization | 916 | 272 |
Other intangible assets, Net | $ 1,021 | 1,665 |
Useful life | 3 years |  |
Backlog [Member] |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |
Original cost | $ 487 | 487 |
Accumulated amortization | 487 | 213 |
Other intangible assets, Net |  | $ 274 |
Useful life | 4 months 24 days |  |

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