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Accounting Policies (Narrative) (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2016 | Sep. 30, 2016 | Jun. 30, 2016 | Mar. 31, 2016 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Research expense |  |  |  |  |  |  |  |  |  |  |  |  | $ 29,800 | $ 30,700 | $ 28,800
Capitalized salaries, travel, and consulting costs related to software development |  |  |  |  |  |  |  |  |  |  |  |  | 1,200 | 1,200 |
Defined benefit pension plan assets | $ 14,200 |  |  |  | $ 16,200 |  |  |  |  |  |  |  | 14,200 | 16,200 |
Gross profit | 87,900 | $ 92,400 | $ 91,700 | $ 77,700 | 77,500 | $ 79,600 | $ 63,200 | $ 76,000 | $ 77,500 | $ 72,600 | $ 78,500 | $ 72,700 | 349,749 | 296,283 | 301,284
Cumulative adjustment to accounts receivable on reclassification |  |  |  |  |  |  |  |  |  |  |  |  | 8,500 |  |
Contract assets receivable | $ 47,400 |  |  |  |  |  |  |  |  |  |  |  | 47,400 |  |
Recorded Charge on BR contract |  |  |  |  |  |  | 15,800 |  |  |  |  |  | 632,730 | 567,434 | 478,555
Inventory write off |  |  |  |  |  |  | 4,000 |  |  |  |  |  |  |  |
Reduction to Cost of goods sold |  |  |  |  |  |  |  |  |  |  |  |  | 4,900 |  |
Write-off deferred contract costs |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Reserve for additional anticipated losses |  |  |  |  |  |  | $ 11,800 |  |  |  |  |  |  |  |
Interest rate on contract receivables | 2.00% |  |  |  |  |  |  |  |  |  |  |  | 2.00% |  |
Extended payment term of receivables |  |  |  |  |  |  |  |  |  |  |  |  | Over a 10 year period starting in 2020 |  |
Percentage of estimate revenue of services |  |  |  |  |  |  |  |  |  |  |  |  | 5.00% |  |
Contracts Accounted for under Percentage of Completion [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Gross profit |  |  |  |  |  |  |  |  |  |  |  |  | $ (500) | (600) | $ 1,500
Long term contract [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Gross profit | $ 1,500 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Unfavorable adjustment charge due to ramp-up inefficiencies | 400 |  |  |  | 400 |  |  |  |  |  |  |  |  |  |
Financial Assets [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Defined benefit pension plan assets | 5,300 |  |  |  | 1,300 |  |  |  |  |  |  |  | 5,300 | 1,300 |
Russia Entity [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Equity method investment | $ 400 |  |  |  | $ 500 |  |  |  |  |  |  |  | $ 400 | $ 500 |

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