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Leases Leases - Additional Information (Details) - USD ($)
$ in Thousands
Jun. 30, 2019
Dec. 31, 2018
Lessee, Lease, Description [Line Items]    
Finance Lease, Right-of-Use Asset $ 246,261 $ 367,164
Finance Lease Accumulated Depreciation $ 15,525 $ 131,971
Minimum    
Lessee, Lease, Description [Line Items]    
Lessee, Operating Lease, Term of Contract 5 years  
Lessee, Operating Lease, Renewal Term 5 years  
Maximum    
Lessee, Lease, Description [Line Items]    
Lessee, Operating Lease, Term of Contract 15 years  
Lessee, Operating Lease, Renewal Term 10 years