Summary of Significant Accounting Policies Principles of Consolidation (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
Dec. 31, 2010
Principles of Consolidation [Abstract]
Stockholders' Equity Note, Spinoff Transaction	$ 250.0

The change in equity as a result of a spin-off transaction (a regular or reverse spin-off) which is based on the recorded amounts.

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

-Publisher FASB

-Name Emerging Issues Task Force (EITF)

-Number 02-11

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009.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 FASB

-Name Accounting Standards Codification

-Glossary Spinoff

-URI http://asc.fasb.org/extlink&oid=6749415

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 505

-SubTopic 60

-Section 25

-Paragraph 2

-URI http://asc.fasb.org/extlink&oid=6406278&loc=d3e26268-112671

Reference 4: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Reverse Spinoff

-URI http://asc.fasb.org/extlink&oid=6524171

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