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Summary of Significant Accounting Policies Intangible Assets (Details) (USD $) | 12 Months Ended |  |  |  |  |
--- | --- | --- | --- | --- | --- | ---
Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |  |  |  |
Cost | $ 24,602,000 | $ 23,457,000 |  |  |  |  |  |
Accumulated Amortization | 14,650,000 | 12,038,000 |  |  |  |  |  |
Net | 9,952,000 | 11,419,000 |  |  |  |  |  |
Amortization [Abstract] |  |  |  |  |  |  |  |
Amortization of Intangible Assets | 2,600,000 | 2,700,000 | 2,800,000 |  |  |  |  |
Finite-Lived Intangible Assets, Amortization Expense, Next Twelve Months |  |  |  |  |  |  |  | 2,500,000
Future Amortization Expense, Year Two |  |  |  |  |  |  | 2,300,000 |
Future Amortization Expense, Year Three |  |  |  |  |  | 1,600,000 |  |
Future Amortization Expense, Year Four |  |  |  |  | 1,000,000 |  |  |
Future Amortization Expense, Year Five |  |  |  | 900,000 |  |  |  |
Patents [Member] |  |  |  |  |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |  |  |  |
Weighted-Average Amortization Life in Years | 9 years | 9 years |  |  |  |  |  |
Cost | 10,287,000 | 9,142,000 |  |  |  |  |  |
Accumulated Amortization | 5,350,000 | 4,335,000 |  |  |  |  |  |
Net | 4,937,000 | 4,807,000 |  |  |  |  |  |
MCDA contract [Member] |  |  |  |  |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |  |  |  |
Weighted-Average Amortization Life in Years | 10 years | 10 years |  |  |  |  |  |
Cost | 8,571,000 | 8,571,000 |  |  |  |  |  |
Accumulated Amortization | 6,571,000 | 5,714,000 |  |  |  |  |  |
Net | 2,000,000 | 2,857,000 |  |  |  |  |  |
Customer Contracts [Member] |  |  |  |  |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |  |  |  |
Weighted-Average Amortization Life in Years | 9 years | 9 years |  |  |  |  |  |
Cost | 5,319,000 | 5,319,000 |  |  |  |  |  |
Accumulated Amortization | 2,317,000 | 1,684,000 |  |  |  |  |  |
Net | 3,002,000 | 3,635,000 |  |  |  |  |  |
Trademarks [Member] |  |  |  |  |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |  |  |  |
Weighted-Average Amortization Life in Years | 4 years | 4 years |  |  |  |  |  |
Cost | 425,000 | 425,000 |  |  |  |  |  |
Accumulated Amortization | 412,000 | 305,000 |  |  |  |  |  |
Net | $ 13,000 | $ 120,000 |  |  |  |  |  |

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