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Shareholders' Equity (Narrative) (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified	12 Months Ended			0 Months Ended		12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011	Feb. 19, 2013 Accelerated Share Repurchase Transaction [Member]	Nov. 20, 2012 Accelerated Share Repurchase Transaction [Member]	Dec. 31, 2013 Repurchases in Accordance with Stock Award Agreements [Member]	Dec. 31, 2012 Repurchases in Accordance with Stock Award Agreements [Member]	Dec. 31, 2013 Share Repurchase Plans, including Accelerated Share Repurchase [Member]	Dec. 31, 2012 Share Repurchase Plans, including Accelerated Share Repurchase [Member]	Dec. 31, 2011 Share Repurchase Plans, including Accelerated Share Repurchase [Member]
Acquisition of treasury stock (shares)				22	65	57	28	336	686	220
Acquisition of treasury stock (value), total	$ 138,903	$ 217,092	$ 63,508			$ 28,916	$ 10,698	$ 109,987	$ 206,394	$ 63,508
Stock repurchase program, authorized amount	700,000				25,000
Percentage of treasury shares acquired					70.00%
Weighted-average price per share				$ 287.20
Value of common shares remaining to be repurchased	90,202
Advance payment under agreement					$ 25,000

X

- Definition

Represents percentage of shares repurchased during the period of the total number of shares to be repurchased calculated using the closing price on the commencement date.

+ References

No definition available.

+ Details

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X

- Definition

Amount of cash receipt from (payment to) bank; or stock received from (issuance to) bank in the settlement of the accelerated share repurchase agreement.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 505

-SubTopic 30

-Section 25

-Paragraph 5

-URI http://asc.fasb.org/extlink&oid=6405686&loc=d3e22802-112653

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- Definition

Amount of a stock repurchase plan authorized by an entity's Board of Directors.

+ References

No definition available.

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- Definition

Amount remaining of a stock repurchase plan authorized by an entity's Board of Directors.

+ References

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- Definition

Total cost of shares repurchased divided by the total number of shares repurchased.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 505

-SubTopic 30

-Section 45

-Paragraph 1

-URI http://asc.fasb.org/extlink&oid=6405813&loc=d3e23239-112655

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- Definition

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 SEC

-Name Regulation S-X (SX)

-Number 210

-Section 04

-Article 3



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 505

-SubTopic 10

-Section 50

-Paragraph 2

-URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21463-112644



Reference 3: http://www.xbrl.org/2003/role/presentationRef

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-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 29, 30

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- Definition

Equity impact of the cost of common and preferred stock that were repurchased during the period. Recorded using the cost method.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 04

-Article 3



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 505

-SubTopic 10

-Section 50

-Paragraph 2

-URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21463-112644



Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 505

-SubTopic 10

-Section S99

-Paragraph 1

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-URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770



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-Topic 505

-SubTopic 30

-Section 45

-Paragraph 1

-URI http://asc.fasb.org/extlink&oid=6405813&loc=d3e23239-112655

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