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Derivative Financial Instruments - Australia Ravenhall (Details) $ in Millions | 3 Months Ended |
--- | --- | ---
Mar. 31, 2019 USD ($) | Mar. 31, 2018 USD ($) | Mar. 31, 2019 AUD ($) | Mar. 31, 2019 USD ($)
Derivative [Line Items] |  |  |  |
Unrealized gain, net of tax, related to cash flow hedge | $ 1,164,000 | $ 736,000 |  |
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 |  |  |  | $ 5,400,000
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 |  |  | $ 448 | $ 318,100,000
Ravenhall, Australia | Cash Flow Hedge |  |  |  |
Derivative [Line Items] |  |  |  |
Unrealized gain, net of tax, related to cash flow hedge | $ 1,200,000 |  |  |

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