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Income Taxes (Narrative) (Details) - USD ($) $ in Thousands | 1 Months Ended | 3 Months Ended | 6 Months Ended |
--- | --- | --- | --- | ---
Jun. 30, 2018 | Apr. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2020 | Dec. 31, 2019 | Jun. 30, 2020
Income Taxes [Line Items] |  |  |  |  |  |  |  |
Income taxes payable |  |  |  | $ 35,166 |  | $ 35,166 |  | $ 64,755
Income taxes paid |  |  |  |  |  | 138,247 | $ 141,948 |
Income tax expense (benefit) |  |  |  | $ 31,078 | $ 18,198 | $ 68,560 | $ 48,637 |
Australian Taxation Office [Member] |  |  |  |  |  |  |  |
Income Taxes [Line Items] |  |  |  |  |  |  |  |
Tax liabilities related to assessments | $ 75,900 | $ 75,900 | $ 151,700 |  |  |  |  |
Accrued interest |  |  | $ 38,400 |  |  |  |  |
Percentage of penalties on additional income tax | 50.00% |  |  |  |  |  |  |

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