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Derivative Financial Instruments - Schedule of interest rate swap agreements (Details) (Interest rate swaps [Member], USD $) In Millions, unless otherwise specified | 12 Months Ended
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Dec. 31, 2010
Counterparty A paying 1.67% interest [Member] |
Derivative financial instruments |
Notional Amount | $ 25.0
Paying | 1.67%
Receiving | 3-Month LIBOR
Counterparty A paying 1.65% interest [Member] |
Derivative financial instruments |
Notional Amount | 25.0
Paying | 1.65%
Receiving | 3-Month LIBOR
Counterparty B paying 1.59% interest [Member] |
Derivative financial instruments |
Notional Amount | 25.0
Paying | 1.59%
Receiving | 3-Month LIBOR
Counterparty B paying 2.14% interest [Member] |
Derivative financial instruments |
Notional Amount | $ 25.0
Paying | 2.14%
Receiving | 3-Month LIBOR

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- Definition Aggregate notional amount specified by the derivative(s). Expressed as an absolute value. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Article 12 -Section 13 -Sentence Column B + Details
Name: | invest_DerivativeNotionalAmount
Namespace Prefix: | invest_
Data Type: | xbrli:monetaryItemType
Balance Type: | na
Period Type: | instant

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- Definition The reference rate for the variable rate of the interest rate derivative, such as LIBOR or the US Treasury rate and the maturity of the reference rate used, such as three months or six months LIBOR. + References No definition available. + Details
Name: | us-gaap_DerivativeDescriptionOfVariableRateBasis
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Fixed interest rate related to the interest rate derivative. + References No definition available. + Details
Name: | us-gaap_DerivativeFixedInterestRate
Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

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- Details
Name: | us-gaap_DerivativeLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration