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Accounting Policies (Narrative) (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
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, 2015 | Sep. 30, 2015 | Jun. 30, 2015 | Mar. 31, 2015 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Research expense |  |  |  |  |  |  |  |  |  |  |  |  | $ 30,700 | $ 28,800 | $ 31,700
Capitalized salaries, travel, and consulting costs related to software development |  |  |  |  |  |  |  |  |  |  |  |  | 1,200 | 1,200 |
Defined benefit pension plan assets | $ 16,200 |  |  |  | $ 7,800 |  |  |  |  |  |  |  | 16,200 | 7,800 |
Gross profit | $ 77,400 | $ 79,400 | $ 63,100 | $ 75,900 | 77,400 | $ 72,400 | $ 78,300 | $ 72,500 | $ 71,700 | $ 75,700 | $ 54,600 | $ 76,700 | 295,780 | 300,568 | 278,686
Recorded Charge on BR contract |  |  | 15,800 |  |  |  |  |  |  |  |  |  |  |  | 14,000
Inventory write off |  |  | 4,000 |  |  |  |  |  |  |  |  |  |  |  |
Reduction to Cost of goods sold |  |  |  |  |  |  |  |  |  |  |  |  | $ 4,900 |  |
Write-off deferred contract costs |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 10,900
Reserve for additional anticipated losses |  |  | $ 11,800 |  |  |  |  |  |  |  |  |  |  |  | 3,100
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% |  |
Increase/(Decrease) in operating cash flows due to change affecting cash payments of taxes in lieu of share issuance |  |  |  |  |  |  |  |  |  |  |  |  | $ 1,300 | 1,400 |
Increase/(Decrease) in financing cash flows due to change affecting cash payments of taxes in lieu of share issuance |  |  |  |  |  |  |  |  |  |  |  |  | (1,300) | (1,400) |
Increase/(Decrease) in operating cash flows due to change affecting classification of excess tax benefits |  |  |  |  |  |  |  |  |  |  |  |  | 100 | 100 |
Increase/(Decrease) in financing cash flows due to change affecting classification of excess tax benefits |  |  |  |  |  |  |  |  |  |  |  |  | (100) | (100) |
Contracts Accounted for under Percentage of Completion [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Gross profit |  |  |  |  |  |  |  |  |  |  |  |  | (600) | 1,500 | $ 400
Financial Assets [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Defined benefit pension plan assets | $ 1,300 |  |  |  | 6,500 |  |  |  |  |  |  |  | 1,300 | 6,500 |
Russia Entity [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Equity method investment | $ 500 |  |  |  | $ 400 |  |  |  |  |  |  |  | $ 500 | $ 400 |

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