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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

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