Leases, Schedule of Rent Expense (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Rental expense [Abstract]
Rental expense	$ 173,988	$ 144,155	$ 162,582
Other Buildings and Equipment [Member]
Rental expense [Abstract]
Rental expense	23,365	15,915	11,182
Barges [Member] | Marine Equipment [Member]
Rental expense [Abstract]
Rental expense	$ 10,234	11,550	13,791
Towing Vessels [Member]
Lease Agreements [Abstract]
Percentage of charter agreement for terms of one year or less	75.00%
Towing Vessels [Member] | Marine Equipment [Member]
Rental expense [Abstract]
Rental expense	$ 140,389	$ 116,690	$ 137,609
Minimum [Member] | Barges [Member]
Lease Agreements [Abstract]
Lease agreements expiring terms	1 year
Minimum [Member] | Towing Vessels [Member]
Lease Agreements [Abstract]
Lease agreements expiring terms	30 days
Maximum [Member] | Barges [Member]
Lease Agreements [Abstract]
Lease agreements expiring terms	12 years
Maximum [Member] | Towing Vessels [Member]
Lease Agreements [Abstract]
Lease agreements expiring terms	10 years