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Long-term Debt Non-Interest Bearing Loan (Details)
$ in Thousands, $ in Millions
12 Months Ended
Dec. 31, 2018
AUD ($)
Dec. 31, 2018
USD ($)
Dec. 31, 2017
USD ($)
Dec. 01, 2010
AUD ($)
Dec. 01, 2010
USD ($)
Debt Instrument [Line Items]          
Non-interest bearing loan, carrying value   $ 2,391,633 $ 2,256,312    
Non interest bearing note [Member]          
Debt Instrument [Line Items]          
Non-interest bearing loan, carrying value $ 3.3 2,400   $ 1.8 $ 1,700
Non-interest bearing loan   $ 35,200   $ 50.0 $ 48,200
Non-interest bearing loan, maturity date Jan. 14, 2054        
Debt instrument, interest rate, effective percentage 8.00% 8.00%