Leases - Schedule of Lease Expense (Details) - USD ($) $ in Thousands	3 Months Ended	6 Months Ended
	Jun. 30, 2019	Jun. 30, 2019
Financial lease costs
Amortization of right-of-use-assets	$ 5,529	$ 8,724
Interest on lease liabilities	1,570	2,166
Total lease costs	38,104	73,089
Commission, transportation and other
Lessee, Lease, Description [Line Items]
Operating lease costs	19,057	38,113
Other operating expenses
Lessee, Lease, Description [Line Items]
Operating lease costs	6,930	13,861
Marketing, selling and administrative expenses
Lessee, Lease, Description [Line Items]
Operating lease costs	$ 5,018	$ 10,225