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Debt (Details 2) - USD ($) $ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2016 | Dec. 31, 2015
Long-term debt |  |  |
Less: current maturities |  | $ 47,545 | $ 27,786
Total long-term debt |  | 397,065 | 436,208
Collateralized debt book value |  | 179,300 |
Recourse |  |  |
Long-term debt |  |  |
Long-term Debt, Gross |  | 447,823 | 463,994
Less: current maturities |  | 47,545 | 27,786
Less: unamortized prepaid debt issuance costs |  | 3,213 | 0
Total long-term debt |  | 397,065 | 436,208
Nonrecourse |  |  |
Long-term debt |  |  |
Less: current maturities |  | 0 | 0
Total long-term debt |  | 0 | 0
Note payable, 4.07%, payable at maturity, due 2021 | Recourse |  |  |
Long-term debt |  |  |
Long-term Debt, Gross |  | $ 26,000 | 0
Interest rate of debt instruments |  | 4.07% |
Senior note payable, 3.72%, payable at maturity, due 2017 | Recourse |  |  |
Long-term debt |  |  |
Long-term Debt, Gross |  | $ 25,000 | 25,000
Interest rate of debt instruments |  | 3.72% |
Note payable, 4.55%, payable at maturity, due 2023 | Recourse |  |  |
Long-term debt |  |  |
Long-term Debt, Gross |  | $ 24,000 | 0
Interest rate of debt instruments |  | 4.55% |
Note payable, 4.85%, payable at maturity, due 2026 | Recourse |  |  |
Long-term debt |  |  |
Long-term Debt, Gross |  | $ 25,000 | 0
Interest rate of debt instruments |  | 4.85% |
Senior note payable, 6.78%, payable at maturity, due 2018 | Recourse |  |  |
Long-term debt |  |  |
Long-term Debt, Gross |  | $ 41,500 | 41,500
Interest rate of debt instruments |  | 6.78% |
Note payable, 4.92%, payable in increasing amounts ($2.2 million for 2016), plus interest, due 2021 | Recourse |  |  |
Long-term debt |  |  |
Long-term Debt, Gross | [1] | $ 20,443 | 22,666
Interest rate of debt instruments |  | 4.92% |
Annual payments |  | $ 2,000 |
Note payable, 4.76%, payable in increasing amounts ($2.0 million for 2016) plus interest, due 2028 | Recourse |  |  |
Long-term debt |  |  |
Long-term Debt, Gross | [1] | $ 47,990 | 49,949
Interest rate of debt instruments |  | 4.76% |
Annual payments |  | $ 2,000 |
Note payable, variable rate (3.12% at December 31, 2016), payable in increasing amounts ($1.3 million for 2016) plus interest, due 2023 | Recourse |  |  |
Long-term debt |  |  |
Long-term Debt, Gross | [1] | $ 19,179 | 20,513
Interest rate of debt instruments |  | 3.12% |
Annual payments |  | $ 1,000 |
Note payable, 3.29%, payable in increasing amounts ($1.3 million for 2016) plus interest, due 2022 | Recourse |  |  |
Long-term debt |  |  |
Long-term Debt, Gross | [1] | $ 21,619 | 22,913
Interest rate of debt instruments |  | 3.29% |
Annual payments |  | $ 1,000 |
Note payable, 4.23%, payable quarterly in varying amounts ($0.6 million for 2016) plus interest, due 2021 | Recourse |  |  |
Long-term debt |  |  |
Long-term Debt, Gross | [1] | $ 11,136 | 11,770
Interest rate of debt instruments |  | 4.23% |
Annual payments |  | $ 1,000 |
Notes payable, variable rate, due 2016 | Recourse |  |  |
Long-term debt |  |  |
Long-term Debt, Gross |  | 0 | 5,043
Note payable, variable rate (2.21% at December 31, 2016), payable in increasing amounts ($1.1 million for 2016) plus interest, due 2023 | Recourse |  |  |
Long-term debt |  |  |
Long-term Debt, Gross | [1] | $ 8,790 | 9,865
Interest rate of debt instruments |  | 1.84% |
Annual payments |  | $ 1,000 |
Note payable, variable rate, due 2016 | Recourse |  |  |
Long-term debt |  |  |
Long-term Debt, Gross | [1] | 0 | 7,350
Note payable, variable rate (2.45% at December 31, 2016), payable in varying amounts ($0.1 million for 2016), plus interest, due 2026 | Recourse |  |  |
Long-term debt |  |  |
Long-term Debt, Gross | [1] | $ 9,016 | 0
Interest rate of debt instruments |  | 2.45% |
Annual payments |  | $ 0 |
Note payable, 4.76%, payable quarterly in varying amounts ($0.4 million for 2016) plus interest, due 2028 | Recourse |  |  |
Long-term debt |  |  |
Long-term Debt, Gross | [1] | $ 8,956 | 9,313
Interest rate of debt instruments |  | 4.76% |
Annual payments |  | $ 0 |
Note payable, 2.21%, payable in increasing amounts ($75.0 million for 2016) plus interest, due 2019 | Recourse |  |  |
Long-term debt |  |  |
Long-term Debt, Gross | [1] | $ 30,000 | 105,000
Interest rate of debt instruments |  | 1.89% |
Annual payments |  | $ 75,000 |
Note payable, 3.33%, payable in increasing amounts ($1.0 million for 2016) plus interest, due 2025 | Recourse |  |  |
Long-term debt |  |  |
Long-term Debt, Gross | [1] | $ 27,000 | 28,000
Interest rate of debt instruments |  | 3.33% |
Annual payments |  | $ 1,000 |
Note payable, 4.5%, payable at maturity, due 2030 | Recourse |  |  |
Long-term debt |  |  |
Long-term Debt, Gross | [1] | $ 16,000 | 16,000
Interest rate of debt instruments |  | 4.50% |
Note payable, 5.0%, payable at maturity, due 2040 | Recourse |  |  |
Long-term debt |  |  |
Long-term Debt, Gross | [1] | $ 14,000 | 14,000
Interest rate of debt instruments |  | 5.00% |
Variable rate (3.05% at December 31, 2016), payable at maturity, due 2017 | Recourse |  |  |
Long-term debt |  |  |
Long-term Debt, Gross | [1] | $ 6,513 | 6,987
Interest rate of debt instruments |  | 2.68% |
Variable rate (2.36% at December 31, 2016), payable at maturity, due 2019 | Recourse |  |  |
Long-term debt |  |  |
Long-term Debt, Gross | [1] | $ 4,650 | 4,650
Interest rate of debt instruments |  | 1.56% |
Variable rate (2.31% at December 31, 2016), payable at maturity, due 2025 | Recourse |  |  |
Long-term debt |  |  |
Long-term Debt, Gross | [1] | $ 3,100 | 3,100
Interest rate of debt instruments |  | 1.56% |
Variable rate (2.28% at December 31, 2016), payable at maturity, due 2036 | Recourse |  |  |
Long-term debt |  |  |
Long-term Debt, Gross | [1] | $ 21,000 | 21,000
Interest rate of debt instruments |  | 1.51% |
Debenture bonds, 2.65% to 5.00%, due 2017 through 2031 | Recourse |  |  |
Long-term debt |  |  |
Long-term Debt, Gross |  | $ 36,931 | $ 39,375
Debenture bonds, 2.65% to 5.00%, due 2017 through 2031 | Recourse | Minimum |  |  |
Long-term debt |  |  |
Interest rate of debt instruments |  | 2.65% |
Debenture bonds, 2.65% to 5.00%, due 2017 through 2031 | Recourse | 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 $179.3 million

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