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Shareholders' Equity (Narrative) (Details) - USD ($) shares in Thousands, $ in Thousands	1 Months Ended	12 Months Ended
	Feb. 03, 2016	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013	Feb. 02, 2016	Jan. 06, 2016
Equity, Class of Treasury Stock [Line Items]
Stock repurchase program, authorized amount		$ 1,300,000
Acquisition of treasury stock (value), total		485,853	$ 88,338	$ 138,903
Value of common shares remaining to be repurchased		$ 116,394
Subsequent Event [Member]
Equity, Class of Treasury Stock [Line Items]
Stock repurchase program, additional authorized amount					$ 300,000	$ 300,000
Acquisition of treasury stock (shares)	609
Acquisition of treasury stock (value), total	$ 270,013
Repurchases in Accordance with Stock Award Agreements [Member]
Equity, Class of Treasury Stock [Line Items]
Acquisition of treasury stock (shares)		1	1	57
Acquisition of treasury stock (value), total		$ 12	$ 342	$ 28,916
Share Repurchase Plans [Member]
Equity, Class of Treasury Stock [Line Items]
Acquisition of treasury stock (shares)		839	154	336
Acquisition of treasury stock (value), total		$ 485,841	$ 87,996	$ 109,987