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Business Acquisition (Narrative) (Details) - USD ($)
$ in Thousands
12 Months Ended
Apr. 08, 2016
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Nov. 07, 2017
Business Acquisition [Line Items]          
Cash consideration for acquisition   $ 187,000  
Goodwill   $ 166,796 $ 160,375 $ 66,373  
Harris Corporation's Composite Aerostructures Division [Member]          
Business Acquisition [Line Items]          
Cash consideration for acquisition $ 187,000        
Goodwill 95,700        
Credit Agreement [Member]          
Business Acquisition [Line Items]          
Proceeds from unsecured credit facility agreement $ 550,000       $ 685,000