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Legal Actions And Contingencies (Narrative) (Details) - USD ($)
$ in Thousands
1 Months Ended 3 Months Ended
Jun. 30, 2018
Mar. 31, 2018
Sep. 30, 2018
Apr. 30, 2018
Loss Contingencies [Line Items]        
Income taxes payable $ 160,427   $ 76,137  
Australian Taxation Office [Member]        
Loss Contingencies [Line Items]        
Percentage of penalties on additional income tax 50.00%      
Income taxes payable       $ 75,900
Tax liabilities related to assessments $ 75,900 $ 151,700    
Interest related to assessments   $ 38,400    
Minimum [Member] | Australian Taxation Office [Member]        
Loss Contingencies [Line Items]        
Tax year under audit   2009 2014  
Maximum [Member] | Australian Taxation Office [Member]        
Loss Contingencies [Line Items]        
Tax year under audit   2013 2017