Repurchases Of Common Stock (Narrative) (Details) (USD $) In Thousands	0 Months Ended	9 Months Ended	1 Months Ended
Jul. 19, 2011	Sep. 30, 2011	Feb. 15, 2011 Accelerated Share Repurchase Agreement [Member]
Equity, Class of Treasury Stock [Line Items]
Stock repurchased authorized amount	$ 250,000
New Credit Facility initiation date		July 15, 2011
Repurchase from Accelerated Stock Repurchase Agreement ("ASR Agreement")		$ 50,000	$ 50,000

Reflects when the credit facility first became available, which may be presented in a variety of ways (year, month and year, day, month and year, quarter).

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

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 129

-Paragraph 2, 4

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009.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 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 19, 22

-Article 5

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.5-02.19(b),22(b))

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

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Data Type:	us-types:dateStringItemType
Balance Type:	na
Period Type:	duration