Goodwill - Schedule of Goodwill (Details) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2014
Dec. 31, 2012
Goodwill [Roll Forward]    
Beginning Balance $ 222,460 $ 222,460
Reallocation of goodwill by Exelis as part of the Spin-off (5,530)  
Ending Balance $ 216,930 $ 222,460