Leases - Schedule of Leases Recorded on Balance Sheet (Details) $ in Thousands	Sep. 30, 2019 USD ($)
ASSETS
Operating lease ROU assets	$ 245,344
Finance lease ROU assets	$ 646,353
Finance Lease, Right-of-Use Asset, Statement of Financial Position [Extensible List]	us-gaap:PropertyPlantAndEquipmentNet
LIABILITIES
Operating	$ 21,963
Finance	$ 133
Finance Lease, Liability, Current, Statement of Financial Position [Extensible List]	us-gaap:LongTermDebtCurrent
Operating	$ 229,297
Finance	$ 968,138
Finance Lease, Liability, Noncurrent, Statement of Financial Position [Extensible List]	eri:LongTermFinancingObligationAndDebt