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Summary of Significant Accounting Policies - Leases Costs (Details)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2019
USD ($)
Sep. 30, 2019
USD ($)
Lessee, Lease, Description [Line Items]    
Operating lease cost $ 114,727 $ 343,282
Depreciation of financing lease right-of-use assets 14,679 45,950
Interest expense for financing lease liabilities 4,905 15,972
Total financing lease cost 19,584 61,922
Variable lease costs $ 26,121 $ 78,712
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 $ 111,423 $ 333,742
Selling, General and Administrative Expenses    
Lessee, Lease, Description [Line Items]    
Operating lease cost $ 3,304 $ 9,540