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Summary of Significant Accounting Policies - Supplemental Balance Sheet (Details) - USD ($)
$ in Thousands
Dec. 31, 2019
Jan. 01, 2019
Dec. 31, 2018
Accounting Policies [Abstract]      
Operating lease right-of-use assets $ 1,869,101 $ 1,825,721 $ 0
Financing lease right-of-use assets, net of accumulated depreciation 327,215 361,078  
Total 2,196,316 2,186,799  
Current      
Operating lease liabilities 223,249 209,911  
Financing lease liabilities 46,582 50,437  
Total current lease liabilities 269,831 260,348  
Long-term      
Operating lease liabilities 1,728,686 1,685,771 $ 0
Financing lease liabilities 320,600 350,263  
Total long-term lease liabilities 2,049,286 2,036,034  
Total $ 2,319,117 $ 2,296,382  
Operating lease, right-of-use asset, real estate assets, percent 99.00%    
Operating lease, right-of-use asset, non-real estate assets, percent 1.00%    
Finance lease, right-of-use asset, real estate assets, percent 69.00%    
Finance lease, right-of-use asset, non-real estate assets, percent 31.00%