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Debt (Details) - USD ($)
Dec. 31, 2015
Dec. 31, 2014
Mar. 04, 2014
Debt Instrument [Line Items]      
Short-term debt $ 16,990,000 $ 2,166,000 $ 90,000,000
Long-term debt      
Total current maturities of long-term debt 27,786,000 76,415,000  
Total long-term debt, less current maturities 436,208,000 298,638,000  
Nonrecourse      
Debt Instrument [Line Items]      
Short-term debt 0 0  
Long-term debt      
Total current maturities of long-term debt 0 0  
Total long-term debt, less current maturities 0 0  
Recourse      
Debt Instrument [Line Items]      
Short-term debt 16,990,000 2,166,000  
Long-term debt      
Total current maturities of long-term debt 27,786,000 76,415,000  
Total long-term debt, less current maturities $ 436,208,000 $ 298,638,000