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Summary of Significant Accounting Policies - Balance Sheets (Details) - USD ($) $ in Thousands | Jun. 30, 2019 | Jan. 01, 2019 | Dec. 31, 2018
--- | --- | --- | ---
Assets: |  |  |
Property and Equipment, net | $ 1,130,942 | $ 1,159,541 | $ 1,178,489
Other Intangible Assets, net | 64,300 | 65,700 | 69,705
Right-of-Use Assets |  | 406,918 | 0
Liabilities: |  |  |
Current lease liabilities |  | 48,832 | 0
Other accrued liabilities | 243,869 | 255,836 | 257,823
Long-Term Debt | 851,283 | 898,222 | 918,779
Long-Term Lease Liabilities |  | 370,647 | 0
Other Long-Term Liabilities | 68,265 | 73,379 | 75,887
Deferred Income Taxes |  | 30,144 | 33,178
Stockholders' Equity: |  |  |
Retained earnings | $ 723,469 | 663,263 | 670,691
ASU 2016-02 |  |  |
Assets: |  |  |
Property and Equipment, net |  | (18,948) |
Other Intangible Assets, net |  | (4,005) | $ (4,000)
Right-of-Use Assets |  | 406,918 |
Liabilities: |  |  |
Current lease liabilities |  | 48,832 |
Other accrued liabilities |  | (1,987) |
Long-Term Debt |  | (20,557) |
Long-Term Lease Liabilities |  | 370,647 |
Other Long-Term Liabilities |  | (2,508) |
Deferred Income Taxes |  | (3,034) |
Stockholders' Equity: |  |  |
Retained earnings |  | $ (7,428) |

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