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Organization and Basis of Presentation Schedule of Revenue by Major Customer (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, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues | $ 164,877 | $ 167,077 | $ 160,617 | $ 155,199 | $ 163,255 | $ 158,443 | $ 159,447 | $ 163,037 | $ 647,770 | $ 644,182 | $ 543,013
Government Contracts Concentration Risk [Member] | Sales Revenue, Segment [Member] |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | $ 86,644 | $ 94,822 | $ 92,192
Concentration Risk, Percentage |  |  |  |  |  |  |  |  | 21.20% | 22.00% | 24.00%
Government Contracts Concentration Risk [Member] | Sales Revenue, Net [Member] |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Concentration Risk, Percentage |  |  |  |  |  |  |  |  | 16.70% | 17.60% | 19.40%

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