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Summary of Significant Accounting Policies - Leases - Costs (Details)
$ in Thousands
 3 Months Ended
Mar. 31, 2019
USD ($)
Lessee, Lease, Description [Line Items]  
Operating lease cost $ 111,906
Depreciation of financing lease right-of-use assets 16,329
Interest expense for financing lease liabilities 6,142
Total financing lease cost 22,471
Variable lease costs $ 25,489
Operating leases, remaining lease term 11 years 1 month 6 days
Finance leases, remaining lease term 11 years
Operating leases, discount rate 7.10%
Financing leases, discount rate 5.70%
Cost of Sales  
Lessee, Lease, Description [Line Items]  
Operating lease cost $ 108,601
Selling, General and Administrative Expenses  
Lessee, Lease, Description [Line Items]  
Operating lease cost $ 3,305