Long-term Debt Schedule of Future Payments Including Capital Leases (Details) $ in Thousands, AUD in Millions	12 Months Ended
	Dec. 31, 2015 AUD	Dec. 31, 2015 USD ($)	Dec. 31, 2014 USD ($)	Dec. 01, 2010 AUD	Dec. 01, 2010 USD ($)
Debt Instrument, Redemption [Line Items]
2016		$ 81,953
2017		127,849
2018		173,029
2019		226,668
2020		1,650,107
Thereafter		80,163
Total		2,339,769
Non-interest bearing loan, carrying value		2,180,847	$ 1,603,772
Non interest bearing note [Member]
Debt Instrument, Redemption [Line Items]
Non-interest bearing loan		36,400		AUD 50.0	$ 48,200
Non-interest bearing loan, maturity date	Jan. 14, 2054
Non-interest bearing loan, carrying value	AUD 2.7	$ 1,900		AUD 1.8	$ 1,700