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Leases - Lessor (Details)
9 Months Ended
Sep. 30, 2019
Lessor, Lease, Description [Line Items]  
Lessor, Operating Lease, Existence of Option to Extend [true false] false
Lessor, Operating Lease, Existence of Option to Terminate [true false] false
Minimum  
Lessor, Lease, Description [Line Items]  
Short-term rental periods for equipment 1 month
Maximum  
Lessor, Lease, Description [Line Items]  
Short-term rental periods for equipment 2 months
Lessor, Operating Lease, Term of Contract 3 months