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Debt (Recourse Debt) (Details) - USD ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Long-term debt |  |
Less: current maturities | $ 75,475 | $ 62,899
Collateralized debt book value | 172,400 |
Recourse |  |
Long-term debt |  |
Long-term debt, gross | 847,650 | 747,184
Less: current maturities | 69,037 | 53,353
Less: unamortized prepaid debt issuance costs | 5,479 | 7,833
Long-term debt, less current maturities | 773,134 | 685,998
Recourse | Note payable, variable rate (1.85% at December 31, 2020), payable in increasing amounts plus interest, due 2026 |  |
Long-term debt |  |
Long-term debt, gross | $ 225,000 | 237,500
Interest rate of debt instruments | 1.85% |
Recourse | Note payable, variable rate (1.60% at December 31, 2020), payable in increasing amounts plus interest, due 2026 |  |
Long-term debt |  |
Long-term debt, gross | $ 150,000 | 0
Interest rate of debt instruments | 1.60% |
Recourse | Note payable, variable rate (1.60% at December 31, 2020), payable in increasing amounts plus interest, due 2024 |  |
Long-term debt |  |
Long-term debt, gross | $ 145,000 | 157,500
Interest rate of debt instruments | 1.60% |
Recourse | Note payable, 4.50%, payable at maturity, due 2034 (a) |  |
Long-term debt |  |
Long-term debt, gross | $ 102,524 | 105,000
Interest rate of debt instruments | 4.50% |
Recourse | Finance lease obligations, due serially to 2030 (a) |  |
Long-term debt |  |
Long-term debt, gross | $ 36,484 | 38,482
Recourse | Note payable, 4.07%, payable at maturity, due 2021 |  |
Long-term debt |  |
Long-term debt, gross | $ 26,000 | 26,000
Interest rate of debt instruments | 4.07% |
Recourse | Note payable, 4.85%, payable at maturity, due 2026 |  |
Long-term debt |  |
Long-term debt, gross | $ 25,000 | 25,000
Interest rate of debt instruments | 4.85% |
Recourse | Note payable, 4.55%, payable at maturity, due 2023 |  |
Long-term debt |  |
Long-term debt, gross | $ 24,000 | 24,000
Interest rate of debt instruments | 4.55% |
Recourse | Note payable, 3.33%, payable in increasing amounts plus interest, due 2025 (a) |  |
Long-term debt |  |
Long-term debt, gross | $ 22,634 | 23,780
Interest rate of debt instruments | 3.33% |
Recourse | Note payable, 3.29%, payable in increasing amounts plus interest, due 2022 (a) |  |
Long-term debt |  |
Long-term debt, gross | $ 16,028 | 17,497
Interest rate of debt instruments | 3.29% |
Recourse | Note payable, 4.50%, payable at maturity, due 2030 |  |
Long-term debt |  |
Long-term debt, gross | $ 16,000 | 16,000
Interest rate of debt instruments | 4.50% |
Recourse | Note payable, 5.00%, payable at maturity, due 2040 |  |
Long-term debt |  |
Long-term debt, gross | $ 14,000 | 14,000
Interest rate of debt instruments | 5.00% |
Recourse | Note payable, variable rate (1.77% at December 31, 2020), payable quarterly, due 2024 (a) |  |
Long-term debt |  |
Long-term debt, gross | $ 11,250 | 12,250
Interest rate of debt instruments | 1.77% |
Recourse | Industrial revenue bond, variable rate (1.88% at December 31, 2020), payable at maturity, due 2036 |  |
Long-term debt |  |
Long-term debt, gross | $ 21,000 | 21,000
Interest rate of debt instruments | 1.88% |
Recourse | Debenture bonds, 2.65% to 4.50%, payable in increasing amounts plus interest, due 2021 through 2031 |  |
Long-term debt |  |
Long-term debt, gross | $ 12,730 | 26,075
Recourse | Debenture bonds, 2.65% to 4.50%, payable in increasing amounts plus interest, due 2021 through 2031 | Minimum |  |
Long-term debt |  |
Interest rate of debt instruments | 2.65% |
Recourse | Debenture bonds, 2.65% to 4.50%, payable in increasing amounts plus interest, due 2021 through 2031 | Maximum |  |
Long-term debt |  |
Interest rate of debt instruments | 4.50% |
Recourse | Industrial revenue bond, variable rate, paid 2020 |  |
Long-term debt |  |
Long-term debt, gross | $ 0 | $ 3,100

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