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Goodwill and Other Intangible Assets (Goodwill) (Details) - USD ($)
$ in Thousands
3 Months Ended
Feb. 11, 2019
Mar. 31, 2019
Goodwill [Roll Forward]    
Beginning balance   $ 400,440
Goodwill resulting from business acquisition $ 214,800 214,793
Foreign currency translation   (81)
Ending balance   $ 615,152