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Derivative Financial Instruments - Australia Ravenhall (Details) $ in Millions | 3 Months Ended |
--- | --- | ---
Mar. 31, 2018 USD ($) | Mar. 31, 2017 USD ($) | Mar. 31, 2018 AUD ($) | Mar. 31, 2018 USD ($)
Derivative [Line Items] |  |  |  |
Unrealized gain, net of tax, related to cash flow hedge | $ 736,000 | $ (479,000) |  |
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 |  |  |  | $ 13,100,000
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 |  |  | $ 466 | $ 358,000,000
Ravenhall, Australia | Cash Flow Hedge |  |  |  |
Derivative [Line Items] |  |  |  |
Unrealized gain, net of tax, related to cash flow hedge | $ 100,000 |  |  |

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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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