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Derivative Financial Instruments - Australia Ravenhall (Details)
AUD in Millions
1 Months Ended 3 Months Ended 9 Months Ended
Sep. 30, 2014
USD ($)
Sep. 30, 2016
USD ($)
Sep. 30, 2015
USD ($)
Sep. 30, 2016
USD ($)
Sep. 30, 2015
USD ($)
Sep. 30, 2016
AUD
Sep. 30, 2016
USD ($)
Derivative [Line Items]              
Unrealized losses, net of tax, related to cash flow hedge   $ 520,000 $ 3,470,000 $ 5,162,000 $ 2,453,000    
Payments on non-recourse debt       1,878,000 $ 6,366,000    
Ravenhall, Australia              
Derivative [Line Items]              
Ineffective portion of Cash Flow Hedge interest rate swap       0      
Ravenhall, Australia | Interest Rate Cap              
Derivative [Line Items]              
Payments on non-recourse debt $ 1,700,000            
Ravenhall, Australia | Other Noncurrent Liabilities              
Derivative [Line Items]              
Fair value of the swap liability             $ 26,900,000
Ravenhall, Australia | Design and construction phase | Interest Rate Swap              
Derivative [Line Items]              
Fixed interest rate on derivative           3.30% 3.30%
Notional amount coincide with the terms of the non-recourse debt           AUD 626 $ 478,000,000
Ravenhall, Australia | Operating phase | Interest Rate Swap              
Derivative [Line Items]              
Fixed interest rate on derivative           4.20% 4.20%
Notional amount coincide with the terms of the non-recourse debt           AUD 466 $ 356,000,000
Ravenhall, Australia | Cash Flow Hedge              
Derivative [Line Items]              
Unrealized losses, net of tax, related to cash flow hedge       $ 5,200,000      
Construction Facility | Non-Recourse Debt | National Australia Bank Limited | Ravenhall              
Derivative [Line Items]              
Lump sum due at completion           AUD 310 $ 237,000,000