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Legal Actions And Contingencies (Narrative) (Details) - USD ($)
$ in Thousands
1 Months Ended 6 Months Ended
Jun. 30, 2018
Apr. 30, 2018
Mar. 31, 2018
Dec. 31, 2019
Jun. 30, 2019
Loss Contingencies [Line Items]          
Income taxes payable       $ 42,904 $ 73,248
Australian Taxation Office [Member]          
Loss Contingencies [Line Items]          
Percentage of penalties on additional income tax 50.00%        
Tax liabilities related to assessments $ 75,900 $ 75,900 $ 151,700    
Interest related to assessments     $ 38,400    
Tax Year 2009 To 2013 [Member] | Minimum [Member] | Australian Taxation Office [Member]          
Loss Contingencies [Line Items]          
Tax year under audit     2009 2009  
Tax Year 2009 To 2013 [Member] | Maximum [Member] | Australian Taxation Office [Member]          
Loss Contingencies [Line Items]          
Tax year under audit     2013 2013  
Tax Year 2014 To 2018 [Member] | Australian Taxation Office [Member]          
Loss Contingencies [Line Items]          
Tax year under audit       2018  
Tax Year 2014 To 2018 [Member] | Minimum [Member] | Australian Taxation Office [Member]          
Loss Contingencies [Line Items]          
Tax year under audit       2014  
Tax Year 2014 To 2018 [Member] | Maximum [Member] | Australian Taxation Office [Member]          
Loss Contingencies [Line Items]          
Tax year under audit       2018