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Shareholders' Equity (Narrative) (Details) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Equity, Class of Treasury Stock [Line Items]
Stock repurchase program, authorized amount	$ 2,600,000
Acquisition of treasury stock (value)	62,854	$ 72,025
Value of common shares remaining to be repurchased	$ 105,068
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)	$ 10,368

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