Debt (Short-term and Long-term) (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Debt Instrument [Line Items]
Total short-term debt	$ 403,703	$ 147,031
Current maturities of long-term debt	75,475	62,899
Less: current maturities	75,475	62,899
Long-term debt, less current maturities	916,540	1,016,248
Total long-term debt, less: current maturities	916,540	1,016,248
Non-recourse
Debt Instrument [Line Items]
Total short-term debt	93,192	54,029
Current maturities of long-term debt	6,438	9,545
Less: current maturities	6,438	9,545
Long-term debt, less current maturities	143,406	330,250
Recourse
Debt Instrument [Line Items]
Total short-term debt	310,511	93,002
Current maturities of long-term debt	69,037	53,354
Less: current maturities	69,037	53,353
Long-term debt, less current maturities	$ 773,134	$ 685,998