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Debt (Details) - USD ($) $ in Thousands | Sep. 30, 2018 | Dec. 31, 2017 | Sep. 30, 2017
--- | --- | --- | ---
Debt Instrument [Line Items] |  |  |
Short-term debt | $ 132,000 | $ 22,000 | $ 19,000
Long-term debt |  |  |
Total current maturities of long-term debt | 15,677 | 54,205 | 53,972
Long-term debt, less current maturities | 437,280 | 418,339 | 371,315
Nonrecourse |  |  |
Debt Instrument [Line Items] |  |  |
Short-term debt | 0 | 0 | 0
Long-term debt |  |  |
Total current maturities of long-term debt | 3,772 | 0 | 0
Long-term debt, less current maturities | 77,114 | 0 | 0
Recourse |  |  |
Debt Instrument [Line Items] |  |  |
Short-term debt | 132,000 | 22,000 | 19,000
Long-term debt |  |  |
Total current maturities of long-term debt | 11,905 | 54,205 | 53,972
Long-term debt, less current maturities | $ 360,166 | $ 418,339 | $ 371,315

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