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Acquisitions - Schedule of Recognized Identified Assets Acquired and Liabilities Assumed (Details) - USD ($)
$ in Thousands
Mar. 31, 2019
Dec. 31, 2018
Feb. 08, 2018
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Assets [Abstract]      
Goodwill $ 1,563,827 $ 1,557,653  
Snell Advanced Media      
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Assets [Abstract]      
Receivables     $ 16,551
Inventory     15,084
Prepaid and other current assets     3,799
Property, plant, and equipment     7,716
Intangible assets     51,000
Goodwill     103,466
Deferred income taxes     1,388
Other long-lived assets     3,046
Total assets acquired     202,050
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Liabilities [Abstract]      
Accounts payable     11,825
Accrued liabilities     25,135
Deferred revenue     8,860
Long-term debt     19,315
Postretirement benefits     31,774
Other long-term liabilities     591
Total liabilities assumed     97,500
Net assets     $ 104,550