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Acquisitions - Narrative (Details) - USD ($)
3 Months Ended 9 Months Ended
Jul. 02, 2020
Jun. 30, 2020
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Jan. 15, 2020
Business Acquisition [Line Items]              
Proceeds from term loan         $ 70,000,000 $ 0  
Business acquisition, transaction costs             $ 1,000,000
Secured Term Loan Facility | Wells Fargo Securities, LLC | Line of Credit              
Business Acquisition [Line Items]              
Proceeds from term loan   $ 70,000,000          
OptimalPlus Ltd              
Business Combinations [Abstract]              
Business acquisition, percentage of voting interests acquired 100.00%            
Consideration Transferred $ 352,642,000            
Business Acquisition [Line Items]              
Business acquisition, percentage of voting interests acquired 100.00%            
Business acquisition, transaction costs     $ 7,000,000   7,000,000    
Cash acquired from acquisition $ 18,000,000            
Business combination, deferred cash consideration $ 12,000,000            
Net sales     309,142,000 $ 348,401,000 929,381,000 1,009,102,000  
Net (loss) attributable to NI     $ 4,907,000 $ 42,522,000 $ 123,766,000 $ 65,796,000