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Leases - Direct Financing Lease (Details) - USD ($)
$ in Thousands
Dec. 31, 2019
Dec. 31, 2018
Jan. 01, 2018
Capital Leased Assets [Line Items]      
Contract liabilities $ 137,805   $ 201,602
Direct financing lease | VOC Equipment      
Capital Leased Assets [Line Items]      
Capital lease receivable   $ 5,900  
Contract liabilities 700    
Deferred Income   $ 1,100  
Future Scheduled Payments:      
2020 1,300    
2021 1,300    
2022 1,300    
2023 600    
Minimum lease payments receivable $ 4,600