Receivables - Schedule of Receivables (Details) - USD ($) $ in Thousands |
12 Months Ended | ||||
|---|---|---|---|---|---|
Dec. 31, 2016 |
Dec. 31, 2015 |
Nov. 19, 2015 |
Nov. 18, 2015 |
Sep. 27, 2014 |
|
| Receivables [Abstract] | |||||
| Billed receivables | $ 41,992 | $ 53,070 | |||
| Unbilled contract receivables | 127,150 | 154,658 | |||
| Other | 2,930 | 2,833 | |||
| Receivables | 172,072 | $ 210,561 | |||
| Accounts, Notes, Loans and Financing Receivable [Line Items] | |||||
| Estimated unbilled contract receivables related to requests for equitable adjustments and contract line item realignments | 3,800 | ||||
| Foreign currency transaction loss | 200 | ||||
| Indemnified receivable | |||||
| Accounts, Notes, Loans and Financing Receivable [Line Items] | |||||
| Exelis indemnified receivable obligation | $ 0 | $ 8,200 | $ 11,400 | ||
| Payment of indemnification liability | $ 8,200 |