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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% |  |

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