Stockholders' Equity Stockholders' Equity (Capital Stock Activity) (Details) In Thousands, unless otherwise specified	12 Months Ended
Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Capital Stock Activity [Line Items]
Common Stock, Issued Shares, Ending Balance	286,300us-gaap_CommonStockSharesIssued	286,300us-gaap_CommonStockSharesIssued
Common Stock Issued
Capital Stock Activity [Line Items]
Common Stock, Issued Shares, Beginning Balance				286,318
Common Stock, Issued Shares, Ending Balance	286,318	286,318	286,318	286,318
Common Stock Held In Employee Benefit Trust
Capital Stock Activity [Line Items]
Common Stock, Issued Shares, Beginning Balance	180	196	169
Net Stock Purchased for (Sold from) Employee Benefit Trust	(13)	(16)	27
Common Stock, Issued Shares, Ending Balance	167	180	196
Common Stock Held in Treasury
Capital Stock Activity [Line Items]
Common Stock, Issued Shares, Beginning Balance	50,318	49,061	48,316
Stock Awards	(547)	(998)	(1,393)
Treasury Stock Purchases	4,855	2,255	2,138
Common Stock, Issued Shares, Ending Balance	54,626	50,318	49,061

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Net stock purchased for (sold from) employee benefit trust

+ References

No definition available.

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- Definition

Total number of common shares of an entity that have been sold or granted to shareholders (includes common shares that were issued, repurchased and remain in the treasury). These shares represent capital invested by the firm's shareholders and owners, and may be all or only a portion of the number of shares authorized. Shares issued include shares outstanding and shares held in the treasury.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.5-02.29)

-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 30

-Article 5

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- Definition

Number of shares (or other type of equity) issued during the period as a result of any equity-based compensation plan other than an employee stock ownership plan (ESOP), net of any shares forfeited. Shares issued could result from the issuance of restricted stock, the exercise of stock options, stock issued under employee stock purchase plans, and/or other employee benefit plans.

+ 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 SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 29, 30

-Article 5

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- Definition

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

+ References

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