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Derivative Financial Instruments (Australia Ravenhall) (Details) $ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2017 USD ($) | Dec. 31, 2016 USD ($) | Dec. 31, 2015 USD ($) | Dec. 31, 2017 AUD
Derivative [Line Items] |  |  |  |
Change in fair value of derivative instrument classified as cash flow hedge | $ 3,985 | $ 1,820 | $ (1,375) |
Payments on non-recourse debt | 307,414 | $ 10,064 | $ 11,908 |
Interest Rate Swap | Asset under Construction | Ravenhall, Australia |  |  |  |
Derivative [Line Items] |  |  |  |
Fixed interest rate on cash flow interest rate derivative |  |  | 3.30% |
Notional amount | 364,000 |  |  | AUD 466,300,000
Interest Rate Swap | Operating Phase of Asset | Ravenhall, Australia |  |  |  |
Derivative [Line Items] |  |  |  |
Fixed interest rate on cash flow interest rate derivative |  |  | 4.20% |
National Australia Bank Limited | Non Recourse Debt | Ravenhall |  |  |  |
Derivative [Line Items] |  |  |  |
Lump sum due at completion | 242,000 |  |  | AUD 310,000,000
Cash Flow Hedging | Ravenhall, Australia |  |  |  |
Derivative [Line Items] |  |  |  |
Change in fair value of derivative instrument classified as cash flow hedge | 4,000 |  |  |
Other Noncurrent Liabilities | Ravenhall, Australia |  |  |  |
Derivative [Line Items] |  |  |  |
Value of swap liability | $ 14,000 |  |  |

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