Impairments and Other Charges (Details)	3 Months Ended
	Mar. 31, 2020 USD ($)
Impairments and Other Charges [Abstract]
Impairment charge	$ 165,304,000
Non-cash write-down	8,000,000
Changes in Goodwill [Roll Forward]
Balance (gross)	973,995,000
Accumulated impairment and amortization	(20,169,000)
Balance	953,826,000
Impairment	(387,970,000)
Convoy acquisition	10,309,000
Balance (gross)	984,304,000
Accumulated impairment and amortization	(408,139,000)
Balance	576,165,000
Marine Transportation [Member]
Changes in Goodwill [Roll Forward]
Balance (gross)	424,149,000
Accumulated impairment and amortization	(18,574,000)
Balance	405,575,000
Impairment	0
Convoy acquisition	0
Balance (gross)	424,149,000
Accumulated impairment and amortization	(18,574,000)
Balance	405,575,000
Distribution and Services [Member]
Changes in Goodwill [Roll Forward]
Balance (gross)	549,846,000
Accumulated impairment and amortization	(1,595,000)
Balance	548,251,000
Impairment	(387,970,000)
Convoy acquisition	10,309,000
Balance (gross)	560,155,000
Accumulated impairment and amortization	(389,565,000)
Balance	$ 170,590,000