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Leases Narrative (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2019
Dec. 31, 2018
Lessee, Lease, Description [Line Items]    
Lease expense $ 2,705  
Equipment    
Lessee, Lease, Description [Line Items]    
Assets under equipment leases, gross   $ 657
Leased assets, depreciation expense $ 55