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Shareholders' Equity (Narrative) (Details) shares in Thousands, $ in Thousands	6 Months Ended
	Jun. 30, 2018 USD ($) shares
Equity, Class of Treasury Stock [Line Items]
Stock repurchase program, authorized amount	$ 2,500,000
Value of common shares remaining to be repurchased	$ 121,868
Repurchases in Accordance with Stock Award Agreements [Member]
Equity, Class of Treasury Stock [Line Items]
Acquisition of treasury stock (shares), total | shares	13
Acquisition of treasury stock (value), total	$ 4,285

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Amount of stock repurchase plan authorized.

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Amount remaining of a stock repurchase plan authorized.

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Number of shares that have been repurchased during the period and are being held in treasury.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.3-04)
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Equity impact of the cost of common and preferred stock that were repurchased during the period. Recorded using the cost method.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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-SubTopic 10
-Section 50
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