Long-term Debt Schedule of Future Payments Including Capital Leases (Details) $ in Thousands, AUD in Millions	12 Months Ended
	Dec. 31, 2016 AUD	Dec. 31, 2016 USD ($)	Dec. 31, 2015 USD ($)	Dec. 01, 2010 AUD	Dec. 01, 2010 USD ($)
Debt Instrument, Redemption [Line Items]
2017		$ 61,080
2018		64,517
2019		77,324
2020		1,548,819
2021		443,956
Thereafter		231,022
Total		2,426,718
Non-interest bearing loan, carrying value		2,273,058	$ 2,157,338
Non interest bearing note [Member]
Debt Instrument, Redemption [Line Items]
Non-interest bearing loan		36,100		AUD 50.0	$ 48,200
Non-interest bearing loan, maturity date	Jan. 14, 2054
Non-interest bearing loan, carrying value	AUD 2.9	$ 2,100		AUD 1.8	$ 1,700