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Summary of Significant Accounting Policies - Leases Costs (Details)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2019
USD ($)
Jun. 30, 2019
USD ($)
Lessee, Lease, Description [Line Items]    
Operating lease cost $ 113,392 $ 222,571
Depreciation of financing lease right-of-use assets 14,942 31,271
Interest expense for financing lease liabilities 4,925 11,067
Total financing lease cost 19,867 42,338
Variable lease costs $ 23,847 $ 46,610
Operating leases, remaining lease term 11 years 11 years
Finance leases, remaining lease term 11 years 11 years
Operating leases, discount rate 7.10% 7.10%
Financing leases, discount rate 5.60% 5.60%
Cost of Sales    
Lessee, Lease, Description [Line Items]    
Operating lease cost $ 110,441 $ 216,335
Selling, General and Administrative Expenses    
Lessee, Lease, Description [Line Items]    
Operating lease cost $ 2,951 $ 6,236