Commitments and Contingencies (Details) (USD $) In Millions, unless otherwise specified	Dec. 31, 2011
Commitments and Contingencies (Textual) [Abstract]
Amount of settlement received in civil suit	$ 3.2

The amount or range of possible amounts of gain that could be realized upon the resolution of a contingency.

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

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 5

-Paragraph 17

Name:	us-gaap_GainContingencyUnrecordedAmount
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant