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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%