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Accounting Policies (Narrative) (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2019 | Sep. 30, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | 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, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Research expense |  |  |  |  |  |  |  |  |  |  |  |  | $ 26,900 | $ 29,800 | $ 30,700
Defined benefit pension plan assets | $ 21,300 |  |  |  | $ 14,200 |  |  |  |  |  |  |  | 21,300 | 14,200 |
Gross profit | $ 96,600 | $ 104,100 | $ 105,200 | $ 91,800 | 87,900 | $ 92,400 | $ 91,700 | $ 77,700 | $ 77,500 | $ 79,600 | $ 63,200 | $ 76,000 | $ 397,701 | 349,749 | $ 296,283
Interest rate on contract receivables | 2.00% |  |  |  |  |  |  |  |  |  |  |  | 2.00% |  |
Extended payment term of receivables |  |  |  |  |  |  |  |  |  |  |  |  | over a 10-year period starting in 2020 |  |
Long term contract [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Gross profit | $ 10,800 |  |  |  | 2,000 |  |  |  | $ 11,500 |  |  |  |  |  |
Financial Assets [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Defined benefit pension plan assets | 800 |  |  |  | 5,300 |  |  |  |  |  |  |  | $ 800 | 5,300 |
Russia Entity [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Equity method investment | $ 500 |  |  |  | $ 400 |  |  |  |  |  |  |  | $ 500 | $ 400 |

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