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General and Summary of Significant Accounting Policies Intangible Assets (Details) - USD ($) $ in Thousands | 12 Months Ended |  |  |  |  |
--- | --- | --- | --- | --- | --- | ---
Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |  |  |  |
Cost | $ 45,699 | $ 26,672 |  |  |  |  |  |
Accumulated Amortization | 21,763 | 19,609 |  |  |  |  |  |
Net | 23,936 | 7,063 |  |  |  |  |  |
Amortization [Abstract] |  |  |  |  |  |  |  |
Amortization of Intangible Assets | $ 2,200 | $ 2,400 | $ 2,500 |  |  |  |  |
Patents [Member] |  |  |  |  |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |  |  |  |
Weighted-Average Amortization Life in Years | 10 years | 9 years |  |  |  |  |  |
Cost | $ 13,308 | $ 12,357 |  |  |  |  |  |
Accumulated Amortization | 8,302 | 7,315 |  |  |  |  |  |
Net | $ 5,006 | $ 5,042 |  |  |  |  |  |
MCDA contract [Member] |  |  |  |  |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |  |  |  |
Weighted-Average Amortization Life in Years | 10 years | 10 years |  |  |  |  |  |
Cost | $ 8,571 | $ 8,571 |  |  |  |  |  |
Accumulated Amortization | 8,571 | 8,285 |  |  |  |  |  |
Net | $ 0 | $ 286 |  |  |  |  |  |
Customer Contracts [Member] |  |  |  |  |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |  |  |  |
Weighted-Average Amortization Life in Years | 9 years | 9 years |  |  |  |  |  |
Cost | $ 5,319 | $ 5,319 |  |  |  |  |  |
Accumulated Amortization | 4,133 | 3,584 |  |  |  |  |  |
Net | $ 1,186 | $ 1,735 |  |  |  |  |  |
Customer-Related Intangible Assets [Member] |  |  |  |  |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |  |  |  |
Weighted-Average Amortization Life in Years | 15 years |  |  |  |  |  |  |
Cost | $ 7,080 |  |  |  |  |  |  |
Accumulated Amortization | 118 |  |  |  |  |  |  |
Net | $ 6,962 |  |  |  |  |  |  |
Trademarks [Member] |  |  |  |  |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |  |  |  |
Weighted-Average Amortization Life in Years | 4 years | 4 years |  |  |  |  |  |
Cost | $ 425 | $ 425 |  |  |  |  |  |
Accumulated Amortization | 425 | 425 |  |  |  |  |  |
Net | $ 0 | $ 0 |  |  |  |  |  |
Trade Names [Member] |  |  |  |  |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |  |  |  |
Weighted-Average Amortization Life in Years | 15 years |  |  |  |  |  |  |
Cost | $ 7,310 |  |  |  |  |  |  |
Accumulated Amortization | 122 |  |  |  |  |  |  |
Net | $ 7,188 |  |  |  |  |  |  |
Developed Technology Rights [Member] |  |  |  |  |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |  |  |  |
Weighted-Average Amortization Life in Years | 10 years |  |  |  |  |  |  |
Cost | $ 3,686 |  |  |  |  |  |  |
Accumulated Amortization | 92 |  |  |  |  |  |  |
Net | $ 3,594 |  |  |  |  |  |  |
Scenario, Forecast [Member] |  |  |  |  |  |  |  |
Amortization [Abstract] |  |  |  |  |  |  |  |
Finite-Lived Intangible Assets, Amortization Expense, Next Twelve Months |  |  |  |  |  |  |  | $ 2,700
Future Amortization Expense, Year Two |  |  |  |  |  |  | $ 2,500 |
Future Amortization Expense, Year Three |  |  |  |  |  | $ 2,400 |  |
Future Amortization Expense, Year Four |  |  |  |  | $ 2,000 |  |  |
Future Amortization Expense, Year Five |  |  |  | $ 1,900 |  |  |  |

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