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Subsequent Events - Additional Information (Details) - USD ($) $ in Millions			3 Months Ended	9 Months Ended
	Oct. 19, 2021	Dec. 09, 2020	Sep. 30, 2021	Sep. 30, 2021
Subsequent Events
Business acquisition, cash paid		$ 89.8
General and Administrative Expense [Member] | Choptank Transport [Member]
Subsequent Events
Business acquisition, related costs			$ 1.1	$ 1.1
Subsequent Event [Member] | Choptank Transport [Member]
Subsequent Events
Business acquisition date	Oct. 19, 2021
Business acquisition, cash paid	$ 130.0
Percentage of equity interests acquired	100.00%
Restricted stock granted	$ 20.0

X

- Definition

Date when the acquirer obtains control of the acquiree, in CCYY-MM-DD format.

+ References

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- Definition

Percentage of voting equity interests acquired at the acquisition date in the business combination.

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- Definition

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- Definition

The cash outflow associated with the acquisition of business during the period. The cash portion only of the acquisition price.

+ References

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- Definition

Value of stock related to Restricted Stock Awards issued during the period, net of the stock value of such awards forfeited.

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- Definition

Detail information of subsequent event by type. User is expected to use existing line items from elsewhere in the taxonomy as the primary line items for this disclosure, which is further associated with dimension and member elements pertaining to a subsequent event.

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No definition available.

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