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Summary of Significant Accounting Policies - Leases - Supplemental Balance Sheet (Details) - USD ($)
$ in Thousands
Mar. 31, 2019
Jan. 01, 2019
Accounting Policies [Abstract]    
Operating Lease, Right-Of-Use Asset, Non-Real Estate Assets, Percent 2.00%  
Operating lease right-of use assets $ 1,791,536 $ 1,825,721
Financing lease right-of-use assets, net of accumulated depreciation 351,750 361,078
Total 2,143,286 2,186,799
Operating lease liabilities 206,286 209,911
Financing lease liabilities 51,222 50,437
Total current lease liabilities 257,508 260,348
Operating lease liabilities 1,656,659 1,685,771
Financing lease liabilities 338,728 350,263
Total long-term lease liabilities 1,995,387 2,036,034
Total $ 2,252,895 $ 2,296,382