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Leases - Direct Financing Lease (Details) - Direct financing lease - USD ($)
Dec. 31, 2017
Dec. 31, 2016
Falcon Spirit Floating, Storage and Offloading Units    
Capital Leased Assets [Line Items]    
Unearned income $ 1,000,000 $ 800,000
Estimated unguaranteed residual value 7,000,000  
Future Scheduled Payments:    
Minimum lease payments receivable 5,300,000 3,800,000
VOC Equipment    
Capital Leased Assets [Line Items]    
Unearned income 1,900,000 2,400,000
Future Scheduled Payments:    
2018 1,400,000  
2019 1,400,000  
2020 1,400,000  
2021 1,400,000  
2022 1,400,000  
Thereafter 600,000  
Minimum lease payments receivable $ 7,600,000 $ 8,400,000.0