Stockholders' Equity (Reconciliation of Common Stock Share Activity) (Details) In Thousands, unless otherwise specified	12 Months Ended
Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Stockholders' Equity Note [Abstract]
Common stock, beginning balance	1,014,027us-gaap_SharesIssued	1,020,057us-gaap_SharesIssued	1,013,164us-gaap_SharesIssued
Common stock, issued	8,103	14,370	14,671
Common stock, retired	(30,110)	(20,400)	(7,778)
Common stock, ending balance	992,020us-gaap_SharesIssued	1,014,027us-gaap_SharesIssued	1,020,057us-gaap_SharesIssued
Held in treasury, beginning balance	(87,041)us-gaap_TreasuryStockShares	(87,041)us-gaap_TreasuryStockShares	(87,041)us-gaap_TreasuryStockShares
Held in treasury, repurchased	(30,110)us-gaap_TreasuryStockSharesAcquired	(20,400)us-gaap_TreasuryStockSharesAcquired	(7,778)us-gaap_TreasuryStockSharesAcquired
Held in treasury, retired	30,110us-gaap_TreasuryStockSharesRetired	20,400us-gaap_TreasuryStockSharesRetired	7,778us-gaap_TreasuryStockSharesRetired
Held in treasury, ending balance	(87,041)us-gaap_TreasuryStockShares	(87,041)us-gaap_TreasuryStockShares	(87,041)us-gaap_TreasuryStockShares

Number of shares of stock issued as of the balance sheet date, including shares that had been issued and were previously outstanding but which are now held in the treasury.

Reference 1: 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

+ Details

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- Details

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- Definition

Number of new stock issued during the period.

+ 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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Namespace Prefix:	us-gaap_
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Balance Type:	na
Period Type:	duration

- Definition

Number of shares that have been repurchased and retired during the period.

+ References

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	duration

- Definition

Number of common and preferred shares that were previously issued and that were repurchased by the issuing entity and held in treasury on the financial statement date. This stock has no voting rights and receives no dividends.

+ 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 210.5-02.28,29)

-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 29, 30

-Article 5

+ Details

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Data Type:	xbrli:sharesItemType
Balance Type:	na
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- Definition

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

+ References

+ Details

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Namespace Prefix:	us-gaap_
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Balance Type:	na
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- Definition

Number of shares of common and preferred stock retired from treasury during the period.

+ References

+ Details

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Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	duration