Debt (Short-term and Long-term) (Details) - USD ($) $ in Thousands	Dec. 31, 2021	Sep. 30, 2021	Dec. 31, 2020
Debt Instrument [Line Items]
Total short-term debt	$ 501,792		$ 403,703
Current maturities of long-term debt	32,256		69,366
Less: current maturities	32,256		69,366
Long-term debt, less current maturities	600,487		886,453
Total long-term debt, less: current maturities	600,487		886,453
Non-recourse
Debt Instrument [Line Items]
Total short-term debt	65,485		93,192
Current maturities of long-term debt	7,601	$ 70,000	678
Less: current maturities	7,601		678
Long-term debt, less current maturities	64,972		127,192
Recourse
Debt Instrument [Line Items]
Total short-term debt	436,307		310,511
Current maturities of long-term debt	24,655		68,688
Less: current maturities	24,655		68,688
Long-term debt, less current maturities	$ 535,515		$ 759,261