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Subsequent Events (Details) (USD $)	0 Months Ended	3 Months Ended		9 Months Ended
	Oct. 03, 2011	Sep. 30, 2011	Sep. 30, 2010	Sep. 30, 2011	Sep. 30, 2010
Subsequent Event [Line Items]
Purchased period of assets	October 3, 2011
Payments for purchase of assets		$ 20,101,000	$ 11,311,000	$ 35,382,000	$ 13,362,000
Assets purchase installment amount, first quarter		125,000
Assets purchase installment amount, second quarter		125,000
Assets purchase installment amount, third quarter		125,000
Assets purchase installment amount, fourth quarter		125,000
Assets purchase installment amount, at closing		2,000,000
Challenge Transport [Member]
Subsequent Event [Line Items]
Payments for purchase of assets		$ 2,500,000

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