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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
	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

X

- 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

X

- 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

X

- 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

X

- Details

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