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Debt (Details) - USD ($) $ in Thousands | Mar. 31, 2018 | Dec. 31, 2017 | Mar. 31, 2017
--- | --- | --- | ---
Debt Instrument [Line Items] |  |  |
Short-term debt | $ 489,000 | $ 22,000 | $ 255,000
Long-term debt |  |  |
Total current maturities of long-term debt | 14,134 | 54,205 | 56,144
Long-term debt, less current maturities | 438,628 | 418,339 | 365,971
Nonrecourse |  |  |
Debt Instrument [Line Items] |  |  |
Short-term debt | 0 | 0 | 0
Long-term debt |  |  |
Total current maturities of long-term debt | 2,922 | 0 | 0
Long-term debt, less current maturities | 72,977 | 0 | 0
Recourse |  |  |
Debt Instrument [Line Items] |  |  |
Short-term debt | 489,000 | 22,000 | 255,000
Long-term debt |  |  |
Total current maturities of long-term debt | 11,212 | 54,205 | 56,144
Long-term debt, less current maturities | $ 365,651 | $ 418,339 | $ 365,971

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