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Leases - Schedule of Lease Expense (Details)
$ in Thousands
 3 Months Ended
Mar. 31, 2019
USD ($)
Financial lease costs  
Amortization of right-of-use-assets $ 3,195
Interest on lease liabilities 596
Total lease costs 35,457
Commission, transportation and other  
Lessee, Lease, Description [Line Items]  
Operating lease costs 19,056
Other operating expenses  
Lessee, Lease, Description [Line Items]  
Operating lease costs 6,931
Marketing, selling and administrative expenses  
Lessee, Lease, Description [Line Items]  
Operating lease costs $ 5,679