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Revenues (Details) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019	Dec. 31, 2019
Disaggregation of Revenue [Abstract]
Revenues by major source	$ 496,567,000	$ 666,809,000	$ 1,681,652,000	$ 2,182,472,000
Revenue recognized			37,153,000	75,105,000
Contract assets	0		0		$ 0
Marine Transportation [Member]
Disaggregation of Revenue [Abstract]
Revenues by major source	320,602,000	412,665,000	1,104,846,000	1,185,072,000
Marine Transportation [Member] | Inland Transportation [Member]
Disaggregation of Revenue [Abstract]
Revenues by major source	247,647,000	316,000,000	869,224,000	909,247,000
Marine Transportation [Member] | Coastal Transportation [Member]
Disaggregation of Revenue [Abstract]
Revenues by major source	72,955,000	96,665,000	235,622,000	275,825,000
Distribution and Services [Member]
Disaggregation of Revenue [Abstract]
Revenues by major source	175,965,000	254,144,000	576,806,000	997,400,000
Distribution and Services [Member] | Oil and Gas [Member]
Disaggregation of Revenue [Abstract]
Revenues by major source	48,741,000	118,096,000	158,043,000	540,061,000
Distribution and Services [Member] | Commercial and Industrial [Member]
Disaggregation of Revenue [Abstract]
Revenues by major source	$ 127,224,000	$ 136,048,000	$ 418,763,000	$ 457,339,000

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Amount, after allowance for credit loss, of right to consideration in exchange for good or service transferred to customer when right is conditioned on something other than passage of time.

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