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Debt (Recourse Debt) (Details) - USD ($) $ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2018 | Dec. 31, 2017
Long-term debt |  |  |
Less: current maturities |  | $ 21,589 | $ 54,205
Long-term debt, less current maturities |  | 496,187 | 418,339
Collateralized debt book value |  | 143,800 |
Recourse |  |  |
Long-term debt |  |  |
Long-term debt, gross |  | 371,791 | 476,220
Less: current maturities |  | 16,747 | 54,205
Less: unamortized prepaid debt issuance costs |  | 5,210 | 3,676
Long-term debt, less current maturities |  | 349,834 | 418,339
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, 4.55%, 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, 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, 6.78%, payable at maturity, paid 2018 |  |  |
Long-term debt |  |  |
Long-term debt, gross |  | $ 0 | 41,500
Interest rate of debt instruments |  | 6.78% |
Recourse | Note payable, 4.92%, payable in increasing amounts ($2.0 million for 2018), plus interest, due 2021 (a) |  |  |
Long-term debt |  |  |
Long-term debt, gross | [1] | $ 16,227 | 18,241
Interest rate of debt instruments |  | 4.92% |
Annual payments |  | $ 2,000 |
Recourse | Note payable, 4.76%, payable in increasing amounts ($1.6 million for 2018) plus interest, due 2028 (a) |  |  |
Long-term debt |  |  |
Long-term debt, gross | [1] | $ 44,330 | 45,936
Interest rate of debt instruments |  | 4.76% |
Annual payments |  | $ 1,600 |
Recourse | Note payable, variable rate (4.85% at December 31, 2018), payable in increasing amounts ($1.3 million for 2018) plus interest, due 2023 (a) |  |  |
Long-term debt |  |  |
Long-term debt, gross | [1] | $ 16,452 | 17,786
Interest rate of debt instruments |  | 4.85% |
Annual payments |  | $ 1,300 |
Recourse | Note payable, 3.29%, payable in increasing amounts ($1.4 million for 2018) plus interest, due 2022 (a) |  |  |
Long-term debt |  |  |
Long-term debt, gross | [1] | $ 18,918 | 20,293
Interest rate of debt instruments |  | 3.29% |
Annual payments |  | $ 1,400 |
Recourse | Note payable, 4.23%, payable quarterly in varying amounts ($0.5 million for 2018) plus interest, due 2021 (a) |  |  |
Long-term debt |  |  |
Long-term debt, gross | [1] | $ 9,948 | 10,479
Interest rate of debt instruments |  | 4.23% |
Annual payments |  | $ 500 |
Recourse | Note payable, variable rate (4.19% at December 31, 2018), payable in varying amounts ($0.3 million for 2018), plus interest, due 2026 (a) |  |  |
Long-term debt |  |  |
Long-term debt, gross | [1] | $ 8,417 | 8,762
Interest rate of debt instruments |  | 4.19% |
Annual payments |  | $ 300 |
Recourse | Note payable, 4.76%, payable quarterly in varying amounts ($0.3 million for 2018) plus interest, due 2028 (a) |  |  |
Long-term debt |  |  |
Long-term debt, gross | [1] | $ 8,288 | 8,581
Interest rate of debt instruments |  | 4.76% |
Annual payments |  | $ 300 |
Recourse | Line of credit, variable rate (3.79% at December 31, 2018), payable at maturity, due 2022 |  |  |
Long-term debt |  |  |
Long-term debt, gross |  | $ 50,000 | 100,000
Interest rate of debt instruments |  | 3.79% |
Annual payments |  | $ 50,000 |
Recourse | Note payable, 3.33%, payable in increasing amounts ($1.1 million for 2018) plus interest, due 2025 (a) |  |  |
Long-term debt |  |  |
Long-term debt, gross | [1] | $ 24,888 | 25,960
Interest rate of debt instruments |  | 3.33% |
Annual payments |  | $ 1,100 |
Recourse | Note payable, 4.5%, 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, 5.0%, 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 (4.15% at December 31, 2018), payable quarterly, ($1.25 million for 2018) due 2024 (a) |  |  |
Long-term debt |  |  |
Long-term debt, gross |  | $ 13,250 | 14,500
Interest rate of debt instruments |  | 4.15% |
Annual payments |  | $ 1,300 |
Recourse | Variable rate (3.19% at December 31, 2018), payable at maturity, due 2019 (a) |  |  |
Long-term debt |  |  |
Long-term debt, gross | [1] | $ 4,650 | 4,650
Interest rate of debt instruments |  | 3.19% |
Recourse | Variable rate (3.18% at December 31, 2018), payable at maturity, due 2025 (a) |  |  |
Long-term debt |  |  |
Long-term debt, gross | [1] | $ 3,100 | 3,100
Interest rate of debt instruments |  | 3.18% |
Recourse | Variable rate (3.14% at December 31, 2018), payable at maturity, due 2036 |  |  |
Long-term debt |  |  |
Long-term debt, gross |  | $ 21,000 | 21,000
Interest rate of debt instruments |  | 3.14% |
Recourse | Debenture bonds, 2.65% to 5.00%, due 2018 through 2032 |  |  |
Long-term debt |  |  |
Long-term debt, gross |  | $ 27,323 | $ 30,432
Recourse | Debenture bonds, 2.65% to 5.00%, due 2018 through 2032 | Minimum |  |  |
Long-term debt |  |  |
Interest rate of debt instruments |  | 2.65% |
Recourse | Debenture bonds, 2.65% to 5.00%, due 2018 through 2032 | Maximum |  |  |
Long-term debt |  |  |
Interest rate of debt instruments |  | 5.00% |
[1] | Debt is collateralized by first mortgages on certain facilities and related equipment or other assets with a book value of $143.8 million

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