Note 5. Partially Owned Leasing Subsidiaries Partially Owned Leasing Subsidiaries (Details)	12 Months Ended
	Dec. 31, 2019 USD ($) board_member subsidiary
Partially-Owned Subsidiaries [Member]
Noncontrolling Interest [Line Items]
Parent Company Guarantees | $	$ 0
Railcar Leasing and Management Services Group [Member] | Partially-Owned Subsidiaries [Member]
Noncontrolling Interest [Line Items]
Carrying Value of Investment In Partially-Owned Consolidated Subsidiary | $	$ 186,500,000
Noncontrolling Interest, Ownership Percentage by Parent	38.00%
Noncontrolling Interest, Ownership Percentage by Noncontrolling Owners	62.00%
Railcar Leasing and Management Services Group [Member] | Partially-Owned Subsidiaries [Member]
Noncontrolling Interest [Line Items]
Number of Subsidiaries | subsidiary	2
Number of Board Members | board_member	7
Number of Board Members of Subsidiary, Designated by Parent | board_member	2