Debt (Short-term and Long-term) (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Debt Instrument [Line Items]
Total Short-term Debt	$ 147,031	$ 205,000
Current maturities of long-term debt	62,899	21,589
Finance lease liability	17,636	0
Total Current Maturities of Long-term Debt	62,899	21,589
Long-term debt, less current maturities	1,016,248	496,187
Finance lease liability	21,501	0
Total Long-term Debt, Less: Current Maturities	1,016,248	496,187
Non-recourse
Debt Instrument [Line Items]
Total Short-term Debt	54,029	0
Current maturities of long-term debt	9,250	4,842
Total Current Maturities of Long-term Debt	9,545	4,842
Long-term debt, less current maturities	329,891	146,353
Recourse
Debt Instrument [Line Items]
Total Short-term Debt	93,002	205,000
Current maturities of long-term debt	36,013	16,747
Total Current Maturities of Long-term Debt	53,353	16,747
Long-term debt, less current maturities	$ 664,856	$ 349,834