Property, Plant and Equipment (Rail Group Assets) (Details) - USD ($) $ in Thousands	3 Months Ended	6 Months Ended
Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020	Dec. 31, 2020
Components of Railcar assets leased to others
Rail Group assets leased to others, gross	$ 735,255	$ 742,107	$ 735,255	$ 742,107	$ 750,473
Less: accumulated depreciation	160,670	149,286	160,670	149,286	158,527
Railcar assets leased to others, net	574,585	592,821	574,585	592,821	$ 591,946
Property, Plant and Equipment [Line Items]
Depreciation and amortization			95,154	93,898
Rail
Property, Plant and Equipment [Line Items]
Depreciation and amortization	$ 7,600	$ 7,700	$ 15,300	$ 15,400

The aggregate expense recognized in the current period that allocates the cost of tangible assets, intangible assets, or depleting assets to periods that benefit from use of the assets.

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The amount of accumulated depreciation, by major property class, recorded on property subject to or available for lease as of the balance sheet date.

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Amount before accumulated depreciation of physical assets used in the normal conduct of business to produce goods and services subject to or available for lease.

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The amount of property, by major property class, net of accumulated depreciation, subject to or available for lease as of the balance sheet date.

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