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Summary Of Significant Accounting Policies Summary of Adoption of New Accounting Pronouncements (Details) - USD ($) $ in Thousands | Mar. 31, 2019 | Jan. 01, 2019 | Dec. 31, 2018 | Mar. 31, 2018 | Jan. 01, 2018 | Dec. 31, 2017
--- | --- | --- | --- | --- | --- | ---
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |
Operating Lease, Right-of-Use Asset | $ 362,568 | $ 352,679 | $ 0 | $ 0 |  |
Prepaid expenses and other current assets | 73,850 |  | 79,500 | 72,788 |  |
Operating Lease, Liability, Current | 59,214 | 57,207 | 0 | 0 |  |
Deferred income taxes | 77,760 |  | 78,155 | 77,043 |  |
Total assets | 2,613,709 | 2,721,400 | 2,368,721 | 2,188,684 |  |
Accrued Liabilities, Current | 224,385 | 272,338 | 275,684 | 206,145 |  |
Operating Lease, Liability, Noncurrent | 337,832 | 329,865 | 0 | 0 |  |
Income taxes payable | 9,302 |  | 22,763 | 10,261 |  |
Total current liabilities | 479,844 | 626,743 | 572,882 | 383,734 |  |
Other Liabilities, Noncurrent | 15,662 | 14,167 | 45,214 | 51,888 |  |
Total liabilities | 893,060 | 1,031,087 | 678,408 | 497,331 |  |
Retained earnings | 1,723,873 |  | 1,677,920 | 1,629,279 |  |
Accumulated other comprehensive loss | (3,318) |  | (4,063) | (8,949) |  | $ (8,887)
Total liabilities and equity | $ 2,613,709 | 2,721,400 | $ 2,368,721 | 2,188,684 |  |
Accounting Standards Update 2014-09 [Member] |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |
Operating Lease, Liability, Current |  | 57,207 |  |  |  |
Total liabilities and equity |  | $ 352,679 |  |  |  |
Accounting Standards Update 2017-12 [Member] |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |
Accumulated other comprehensive loss |  |  |  | $ (515) | $ (515) |

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