Income Taxes - Narrative (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Dec. 30, 2015
Sep. 24, 2015
Sep. 27, 2014
Dec. 31, 2013
Significant Change in Unrecognized Tax Benefits is Reasonably Possible [Line Items]              
Valuation allowance $ 200            
Unrecognized tax benefits 429 $ 0 $ 7,604       $ 8,541
Unrecognized tax benefits settled 6,900            
Balance of unrecognized tax benefits lapsed 700            
Interest expense related to tax matters 0 100 0        
Interest accrued for tax matters (less than $0.3 million in 2013) 0 0 600        
Interest payable (13,532) (2,458) (14,079)        
Selling, general and administrative expenses 64,086 65,687 $ 80,340        
Spinoff | Indemnified receivable              
Significant Change in Unrecognized Tax Benefits is Reasonably Possible [Line Items]              
Income taxes   0     $ 3,200    
Interest payable   $ 3,200          
Indemnification receivable 0     $ 3,300      
Selling, general and administrative expenses $ 3,300            
Spinoff | Indemnified receivable | Exelis              
Significant Change in Unrecognized Tax Benefits is Reasonably Possible [Line Items]              
Income tax indemnification amount           $ 3,300