Repurchases Of Common Stock (Accelerated Stock Repurchase Program) (Details) (USD $) In Thousands, except Share data	9 Months Ended
Sep. 30, 2011
Accelerated Share Repurchases [Line Items]
Shares Delivered	1,056,738
Repurchase Amount	$ 50,000
ASR Agreement Settlement Date 2/15/2011 [Member]
Accelerated Share Repurchases [Line Items]
Shares Delivered	377,660
Average Price	$ 47.32
Repurchase Amount	17,869
ASR Agreement Settlement Date 5/19/2011 [Member]
Accelerated Share Repurchases [Line Items]
Shares Delivered	679,078
Average Price	$ 47.32
Repurchase Amount	$ 32,131

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

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

-Publisher AICPA

-Name Accounting Principles Board Opinion (APB)

-Number 12

-Paragraph 10

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

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

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 04

-Article 3

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

Name:	us-gaap_TreasuryStockSharesAcquired
Namespace Prefix:	us-gaap
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	duration