Leases - Schedule of Leases Recorded on Balance Sheet (Details) $ in Thousands	Mar. 31, 2019 USD ($)
Assets
Operating lease ROU assets	$ 282,363
Operating Lease, Right-of-Use Asset, Statement of Financial Position [Extensible List]	us-gaap:OtherAssetsNoncurrent
Finance lease ROU assets	$ 949,839
Finance Lease, Right-of-Use Asset, Statement of Financial Position [Extensible List]	us-gaap:PropertyPlantAndEquipmentNet
Liabilities
Operating	$ 20,232
Operating Lease, Liability, Current, Statement of Financial Position [Extensible List]	us-gaap:OtherAccruedLiabilitiesCurrent
Finance	$ 314
Finance Lease, Liability, Current, Statement of Financial Position [Extensible List]	us-gaap:LongTermDebtCurrent
Operating	$ 266,898
Operating Lease, Liability, Noncurrent, Statement of Financial Position [Extensible List]	us-gaap:OtherLiabilitiesNoncurrent
Finance	$ 962,685
Finance Lease, Liability, Noncurrent, Statement of Financial Position [Extensible List]	eri:LongTermFinancingObligationAndDebt