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Derivative Financial Instruments - Australia Ravenhall (Details) AUD in Millions | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2017 USD ($) | Jun. 30, 2016 USD ($) | Jun. 30, 2017 USD ($) | Jun. 30, 2016 USD ($) | Jun. 30, 2017 AUD | Jun. 30, 2017 USD ($)
Derivative [Line Items] |  |  |  |  |  |
Unrealized losses, net of tax, related to cash flow hedge | $ (1,295,000) | $ 2,198,000 | $ (816,000) | $ 4,642,000 |  |
Ravenhall, Australia |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |
Ineffective portion of Cash Flow Hedge interest rate swap |  |  | 0 |  |  |
Ravenhall, Australia | Other Noncurrent Liabilities |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |
Fair value of the swap liability |  |  |  |  |  | $ 17,700,000
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 671 | $ 516,000,000
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 | $ 358,000,000
Ravenhall, Australia | Cash Flow Hedge |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |
Unrealized losses, net of tax, related to cash flow hedge |  |  | $ 800,000 |  |  |
Construction Facility | Non-Recourse Debt | National Australia Bank Limited | Ravenhall |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |
Lump sum due at completion |  |  |  |  | AUD 310 | $ 238,000,000

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