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Shareholders' Equity (Narrative) (Details) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended				6 Months Ended
	Jun. 30, 2019	Mar. 31, 2019	Jun. 30, 2018	Mar. 31, 2018	Jun. 30, 2019	Jul. 23, 2019
Equity, Class of Treasury Stock [Line Items]
Stock repurchase program, authorized amount	$ 2,600,000				$ 2,600,000
Acquisition of treasury stock (value)	58,512	$ 62,854	$ 28,675	$ 72,025
Value of common shares remaining to be repurchased	$ 46,589				$ 46,589
Repurchases in Accordance with Stock Award Agreements [Member]
Equity, Class of Treasury Stock [Line Items]
Acquisition of treasury stock (shares)					17
Acquisition of treasury stock (value)					$ 10,398
Subsequent Event [Member]
Equity, Class of Treasury Stock [Line Items]
Stock repurchase program, authorized amount						$ 100,000

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