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Impairment of Long-lived Assets (Details) $ / shares in Units, $ in Thousands	3 Months Ended		12 Months Ended
	Dec. 31, 2018 USD ($) $ / shares	Dec. 31, 2017 USD ($) $ / shares	Dec. 31, 2018 USD ($) TankBarge	Dec. 31, 2017 USD ($)	Dec. 31, 2016 USD ($)
Long-lived Assets Impairment [Abstract]
Non-cash pre-tax impairment charge	$ 82,705	$ 105,712	$ 82,705	$ 105,712	$ 0
Impairment charge after tax effect	$ 65,337	$ 66,975
Impairment charge after tax effect on earning per share (in dollars per share) | $ / shares	$ 1.09	$ 1.20
Lease cancellation costs			2,403	0	$ 0
Vessels [Member]
Long-lived Assets Impairment [Abstract]
Non-cash pre-tax impairment charge	$ 78,835
Fair market value of assets	13,247	$ 12,550	13,247	$ 12,550
Tank Barge [Member]
Long-lived Assets Impairment [Abstract]
Non-cash pre-tax impairment charge			$ 3,870
Number of vessels to be disposed of | TankBarge			4
Fair market value of assets	220		$ 220
Scrap value of vessel	$ 220		220
Lease cancellation costs			$ 2,403

X

- Definition

Amount of write-down of assets net of tax recognized in the income statement. Includes, but is not limited to, losses from tangible assets, intangible assets and goodwill.

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Number of assets held-for-sale that are not part of a disposal group, expected to be disposed of after one year or the normal operating cycle, if longer.

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The amount lease termination expense.

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- Definition

Fair value portion of probable future economic benefits obtained or controlled by an entity as a result of past transactions or events.

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Amount classified as property, plant and equipment attributable to disposal group held for sale or disposed of.

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After tax earnings per share or per unit impact arising from asset impairment.

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The aggregate amount of write-downs for impairments recognized during the period for long-lived assets held for abandonment, exchange or sale.

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