Receivables - Schedule of Receivables (Details) - USD ($) $ in Thousands |
Apr. 03, 2020 |
Dec. 31, 2019 |
|---|---|---|
| Receivables [Abstract] | ||
| Billed receivables | $ 52,296 | $ 71,068 |
| Unbilled receivables (contract assets) | 199,576 | 186,365 |
| Other | 11,729 | 11,711 |
| Total receivables | 263,601 | $ 269,144 |
| Estimate of unbilled contract receivables | $ 7,000 |