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 -Name Regulation S-X (SX)
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 -Section 02
 -Paragraph 3
 -Subparagraph a(1)
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 -Section 02
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USD ($)
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12/31/2009
USD ($)
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 -Publisher SEC
 -Name Regulation S-X (SX)
 -Number 210
 -Section 02
 -Paragraph 3
 -Subparagraph a(1)
 -Article 5

Reference 2: http://www.xbrl.org/2003/role/presentationRef
 -Publisher SEC
 -Name Regulation S-X (SX)
 -Number 210
 -Section 02
 -Paragraph 4
 -Article 5

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12/31/2010
USD ($)
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12/31/2009
USD ($)
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 -Publisher SEC
 -Name Regulation S-X (SX)
 -Number 210
 -Section 02
 -Paragraph 3
 -Subparagraph a(1)
 -Article 5

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 -Section 02
 -Paragraph 4
 -Article 5

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12/31/2010
USD ($)
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12/31/2009
USD ($)
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 -Publisher SEC
 -Name Regulation S-X (SX)
 -Number 210
 -Section 02
 -Paragraph 3
 -Subparagraph a(1)
 -Article 5

Reference 2: http://www.xbrl.org/2003/role/presentationRef
 -Publisher SEC
 -Name Regulation S-X (SX)
 -Number 210
 -Section 02
 -Paragraph 4
 -Article 5

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{us-gaap_AccountsNotesLoansAndFinancingReceivablesByBillingStatusTypeAxis} : Unbilled [Member]
12/31/2010
USD ($)
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12/31/2009
USD ($)
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 -Article 5

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USD ($)
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 -Name Regulation S-X (SX)
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Reference 2: http://www.xbrl.org/2003/role/presentationRef
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 -Number 210
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 -Paragraph 4
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USD ($)
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12/31/2009
USD ($)
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 -Article 5

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Reference 2: http://www.xbrl.org/2003/role/presentationRef
 -Publisher SEC
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USD ($)
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USD ($)
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Reference 2: http://www.xbrl.org/2003/role/presentationRef
 -Publisher SEC
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12/31/2010
USD ($)
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12/31/2009
USD ($)
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 -Name Regulation S-X (SX)
 -Number 210
 -Section 02
 -Paragraph 3
 -Subparagraph a(1)
 -Article 5

Reference 2: http://www.xbrl.org/2003/role/presentationRef
 -Publisher SEC
 -Name Regulation S-X (SX)
 -Number 210
 -Section 02
 -Paragraph 4
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12/31/2010
USD ($)
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12/31/2009
USD ($)
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 -Publisher SEC
 -Name Regulation S-X (SX)
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 -Article 5

Reference 2: http://www.xbrl.org/2003/role/presentationRef
 -Publisher SEC
 -Name Regulation S-X (SX)
 -Number 210
 -Section 02
 -Paragraph 4
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12/31/2010
USD ($)
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12/31/2009
USD ($)
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 -Publisher SEC
 -Name Regulation S-X (SX)
 -Number 210
 -Section 02
 -Paragraph 3
 -Subparagraph a(1)
 -Article 5

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 -Section 02
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{us-gaap_AccountsNotesLoansAndFinancingReceivablesByBillingStatusTypeAxis} : Billed [Member]
12/31/2010
USD ($)
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{us-gaap_AccountsNotesLoansAndFinancingReceivablesByBillingStatusTypeAxis} : Billed [Member]
12/31/2009
USD ($)
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 -Publisher SEC
 -Name Regulation S-X (SX)
 -Number 210
 -Section 02
 -Paragraph 3
 -Subparagraph a(1)
 -Article 5

Reference 2: http://www.xbrl.org/2003/role/presentationRef
 -Publisher SEC
 -Name Regulation S-X (SX)
 -Number 210
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{us-gaap_AccountsNotesLoansAndFinancingReceivablesByBillingStatusTypeAxis} : Billed [Member]
12/31/2010
USD ($)
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{us-gaap_AccountsNotesLoansAndFinancingReceivablesByBillingStatusTypeAxis} : Billed [Member]
12/31/2009
USD ($)
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 -Paragraph 3
 -Subparagraph a(1)
 -Article 5

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12/31/2010
USD ($)
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12/31/2009
USD ($)
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 -Publisher SEC
 -Name Regulation S-X (SX)
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 -Section 02
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 -Subparagraph a(1)
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Reference 2: http://www.xbrl.org/2003/role/presentationRef
 -Publisher SEC
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 -Number 210
 -Section 02
 -Paragraph 4
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12/31/2010
USD ($)

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12/31/2009
USD ($)

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12/31/2010
USD ($)

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12/31/2009
USD ($)

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 -Section 02
 -Paragraph 4
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12/31/2010
USD ($)

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12/31/2009
USD ($)

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12/31/2010
USD ($)

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12/31/2009
USD ($)

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12/31/2010
USD ($)

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12/31/2009
USD ($)

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