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Derivative Financial Instruments (Australia Ravenhall) (Details) $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2018 USD ($) | Dec. 31, 2017 USD ($) | Dec. 31, 2016 USD ($) | Dec. 31, 2018 AUD ($)
Derivative [Line Items] |  |  |  |
Change in fair value of derivative instrument classified as cash flow hedge | $ 6,146,000 | $ 3,985,000 | $ 1,820,000 |
Ravenhall, Australia |  |  |  |
Derivative [Line Items] |  |  |  |
Gain (loss) on interest rate cash flow hedge ineffectiveness | 0 | 0 |  |
Interest Rate Swap | Asset under Construction | Ravenhall, Australia |  |  |  |
Derivative [Line Items] |  |  |  |
Fixed interest rate on cash flow interest rate derivative |  |  | 3.30% |
Notional amount | 318,000,000 |  |  | $ 450.8
Interest Rate Swap | Operating Phase of Asset | Ravenhall, Australia |  |  |  |
Derivative [Line Items] |  |  |  |
Fixed interest rate on cash flow interest rate derivative |  |  | 4.20% |
Cash Flow Hedging | Ravenhall, Australia |  |  |  |
Derivative [Line Items] |  |  |  |
Change in fair value of derivative instrument classified as cash flow hedge | 6,100,000 | 1,800,000 | $ 4,000,000 |
Other Noncurrent Liabilities | Ravenhall, Australia |  |  |  |
Derivative [Line Items] |  |  |  |
Value of swap liability | $ 6,800,000 | $ 14,000,000 |  |

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- Definition Aggregate notional amount specified by the derivative(s). Expressed as an absolute value. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Article 12 -Section 13 -Sentence Column B + Details
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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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4C -Subparagraph (d)(1) -URI http://asc.fasb.org/extlink&oid=109980867&loc=SL5624171-113959 + Details
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