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Acquisition of Nora - Schedule of Assets Acquired and Liabilities Assumed (Details) - Nora
$ in Thousands
Aug. 07, 2018
USD ($)
Business Acquisition [Line Items]  
Assets acquired (excluding goodwill) $ 359,335
Liabilities assumed (114,049)
Net assets acquired 245,286
Purchase price 447,192
Goodwill, excess of purchase price $ 201,906