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Variable Interest Entity (Details Textuals) (Variable Interest Entity, Primary Beneficiary, USD $)	6 Months Ended
	Jun. 30, 2012	Dec. 31, 2011
Variable Interest Entity, Primary Beneficiary
Variable Interest Entity [Line Items]
Variable Interest Entity, Nonexistence Flag	No
The carrying amount of the assets and liabilities of this entity in balance sheet	$ 0	$ 0
Involvement with entity	$ 0	$ 0
Variable Interest Entity, Similar Entity Aggregation, Description	We are not the primary beneficiary of this entity because of shared power. Therefore, we do not consolidate this entity's financial results into our financial statements.

X

- Definition

The reporting entity's maximum amount of exposure to loss as a result of its involvement with the Variable Interest Entity (VIE).

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 810

-SubTopic 10

-Section 50

-Paragraph 4

-Subparagraph b

-URI http://asc.fasb.org/extlink&oid=7880789&loc=d3e5728-111685



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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 810

-SubTopic 10

-Section 50

-Paragraph 6

-Subparagraph (c)

-URI http://asc.fasb.org/extlink&oid=7880789&loc=d3e5747-111685



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

-Publisher FASB

-Name FASB Staff Position (FSP)

-Number FAS140-4/FIN46(R)

-Paragraph C6

-Subparagraph b

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009.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

+ Details

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

X

- Details

Name:	us-gaap_VariableInterestEntityLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Net carrying amount of the assets and liabilities in the reporting entity's statement of financial position that relate to the reporting entity's variable interest in the Variable Interest Entity (VIE), when the reporting entity is not the VIE's primary beneficiary.

+ References

No definition available.

+ Details

Name:	us-gaap_VariableInterestEntityNonconsolidatedCarryingAmountAssetsAndLiabilitiesNet
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

An assertion that there are no Variable Interest Entities (VIE) about which the entity is required to make any GAAP disclosures.

+ References

No definition available.

+ Details

Name:	us-gaap_VariableInterestEntityNonexistenceFlag
Namespace Prefix:	us-gaap_
Data Type:	us-types:yesNoItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Describes how the entity aggregates Variable Interest Entities (VIE) for disclosure purposes, distinguishing between (a) VIEs that are not consolidated because the enterprise is not the primary beneficiary but has a variable interest and (b) VIEs that are consolidated.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 810

-SubTopic 10

-Section 50

-Paragraph 9

-URI http://asc.fasb.org/extlink&oid=7880789&loc=SL6228884-111685



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

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 167

-Paragraph 22C

-Appendix D

+ Details

Name:	us-gaap_VariableInterestEntitySimilarEntityAggregationDescription
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration