Shareholders' Equity (Details) - USD ($) $ in Thousands, shares in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Equity [Abstract]
Stock Repurchased During Period, Value	$ 132,900	$ 81,352	$ 132,889	$ 100,426
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