Shareholders' Equity (Details) - USD ($) $ in Thousands, shares in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Equity [Abstract]
Stock Repurchased During Period, Value	$ 132,900	$ 15,769	$ 132,889	$ 116,195
Stock Repurchase Program, Authorized Amount	$ 1,100,000		$ 1,100,000
Stock Repurchase Program Number Of Shares Repurchased To Date			26.8
Stock Repurchased To Date Value			$ 1,017,800