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Acquisitions and Divestitures Opening Balance Sheet (Details) - USD ($)
$ in Thousands
Dec. 31, 2019
Oct. 01, 2019
Sep. 30, 2019
Business Acquisition [Line Items]      
Goodwill $ 397,006   $ 392,890
Frontier [Member]      
Business Acquisition [Line Items]      
Current assets   $ 3,084  
Property, plant and equipment   3,824  
Goodwill   1,403  
Intangible assets   11,516  
Total assets acquired   19,827  
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Financial Liabilities   (7,673)  
Total liabilities assumed   (994)  
Net assets acquired   $ 11,160