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Shareholders' Equity (Narrative) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended	78 Months Ended
	Mar. 31, 2015	Mar. 31, 2015
Shareholders’ Equity [Abstract]
Stock repurchase program, authorized amount	$ 900,000us-gaap_StockRepurchaseProgramAuthorizedAmount1	$ 900,000us-gaap_StockRepurchaseProgramAuthorizedAmount1
Acquisition of treasury stock (shares)	34us-gaap_TreasuryStockSharesAcquired	4,247us-gaap_TreasuryStockSharesAcquired
Acquisition of treasury stock (value), total	23,249us-gaap_TreasuryStockValueAcquiredCostMethod	721,335us-gaap_TreasuryStockValueAcquiredCostMethod
Value of common shares remaining to be repurchased	$ 178,963us-gaap_StockRepurchaseProgramRemainingAuthorizedRepurchaseAmount1	$ 178,963us-gaap_StockRepurchaseProgramRemainingAuthorizedRepurchaseAmount1

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- Definition

Amount of stock repurchase plan authorized.

+ References

No definition available.

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- Definition

Amount remaining of a stock repurchase plan authorized.

+ References

No definition available.

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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

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 29, 30

-Article 5

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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

-Subparagraph (SX 210.3-04)

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



Reference 4: 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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