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Derivative Financial Instruments - Australia Ravenhall (Details) $ in Millions | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2018 USD ($) | Jun. 30, 2017 USD ($) | Jun. 30, 2018 USD ($) | Jun. 30, 2017 USD ($) | Jun. 30, 2018 AUD ($)
Derivative [Line Items] |  |  |  |  |
Unrealized gain, net of tax, related to cash flow hedge | $ 2,278,000 | $ 1,295,000 | $ 3,014,000 | $ 816,000 |
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 | $ 10,400,000 |  | $ 10,400,000 |  |
Ravenhall, Australia | Operating phase | Interest Rate Swap |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Fixed interest rate on derivative | 4.20% |  | 4.20% |  | 4.20%
Notional amount coincide with the terms of the non-recourse debt | $ 339,000,000 |  | $ 339,000,000 |  | $ 457
Ravenhall, Australia | Cash Flow Hedge |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Unrealized gain, net of tax, related to cash flow hedge |  |  | $ 3,000,000 |  |

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- Definition The net gain (loss) during the reporting period due to ineffectiveness in interest rate cash flow hedges. Recognized in earnings. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4C -Subparagraph (d)(1) -URI http://asc.fasb.org/extlink&oid=84234895&loc=SL5624171-113959 + Details
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