Goodwill and Other Intangible Assets (Schedule of Goodwill) (Details) - USD ($) $ in Thousands	9 Months Ended	12 Months Ended
	Sep. 30, 2020	Dec. 31, 2019
Goodwill [Roll Forward]
Goodwill	$ 1,191,259	$ 1,085,806
Acquisitions		105,453
Acquisition fair value adjustment	11
Goodwill	$ 1,191,270	$ 1,191,259