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Summary of Significant Accounting Policies - Supplemental Balance Sheet (Details) - USD ($)
$ in Thousands
Jun. 30, 2019
Jan. 01, 2019
Dec. 31, 2018
Accounting Policies [Abstract]      
Operating lease right-of-use assets $ 1,793,807 $ 1,825,721 $ 0
Financing lease right-of-use assets, net of accumulated depreciation 344,320 361,078  
Total 2,138,127 2,186,799  
Current      
Operating lease liabilities 212,968 209,911  
Financing lease liabilities 50,116 50,437  
Total current lease liabilities 263,084 260,348  
Long-term      
Operating lease liabilities 1,655,477 1,685,771 $ 0
Financing lease liabilities 331,233 350,263  
Total long-term lease liabilities 1,986,710 2,036,034  
Total $ 2,249,794 $ 2,296,382  
Operating lease, right-of-use asset, real estate assets, percent 98.00%    
Operating lease, right-of-use asset, non-real estate assets, percent 2.00%    
Finance lease, right-of-use asset, real estate assets, percent 62.00%    
Finance lease, right-of-use asset, non-real estate assets, percent 38.00%